From reading the above it’s clear, to me at least, that Marx shows the popular opinions and ideas come from the establishment–the ruling classes, and there is no reason to believe there are any exceptions today. All popular ideas, although false - such as antiracism, multiculturalism, equality, globalism, “Gods chosen”, &c - are the ideas of the elite, the ruling classes and not the ideas of the people as the people are simple followers and therefore live under, and adapt to, the circumstances their rulers have given them. The ideas of the people are not their own as they aren’t the producers of ideas themselves; they are the ideas pushed by the ruling elite who are themselves the producers of ideas - those who form the status-quo/the current conditions of our existence - and thus these ideas are the default ideologies and perspectives of the people being ruled. Naturally, there are always exceptions in the individual, however, society isn’t made up of exceptions but rather of generalisations.
Contrary to popular belief, which is of course nothing more than the ideas of the elite reflected and expressed through the people, the masses do not think for themselves. The many people and groups such as communists, social outcasts, punk rockers, militant atheists, "neo-Nazis," and most “free thinkers” &c that “revolt” against society are not revolting against anything; no, in fact they are merely living within the acceptable laws and boundaries of the ruling ideas set in place by the ruling elite; these same ideas were pre-approved by the ruling elite long before they were handed down to the people for mass consumption.
True free thinking folk rarely share ideas with the masses, none of any significance anyway, as popular ideas require no contribution (mental production) of independent thought from those who hold them. What they do require is for the people to have a herd mentality; to be good followers; and to obey commands - subliminal or otherwise - via the televisions and magazines, which is most certainly what is occurring. For everyone following an existing idea, i.e., the status-quo as produced by the ruling class, it's far easier and less stressful than independently introducing a new idea, and it's also the default position of the lives of the masses. Thus leading an unpopular idea, hence, almost always a correct idea, has no reward in a world of followers of popular opinion other than the fact that you know yourself to be an honest man of truth, and regardless of the consequences you can, and do, stand on your own with little if any support.
Every so called “free and open thinker” with which I've conversed has been extremely narrow minded and arrogant the instant the conversation moves outside of their allotted space of “free thought” as handed down to them by the producers of “their” ideas. They are free to think as they wish but only within the limits and rules of the status-quo set for them by the ruling elite.
In this politically correct civilisation of ours, or even any large civilisation of the past, real freedom is a delusion; it's freedom to an extent, and only within the confines of the rules, pre-produced ideas, and psychological chains of the dictatorship of the elite corporate-government think tank. Government power itself is an illusion and it only exists in the imaginary aether of mass hypnosis of the collective mind because the people have unwittingly agreed to it; they have accepted, without question and thus by default, the popular ideas produced for them. The illusion of power with which the ruling political establishment has created havoc upon countless lives comes crashing down when/if the people wake up and realise it only existed because they accepted it existed and henceforth, they will no longer accept it.
Knowing this, any and all truly free and logical thought is instantly extinguished by the elite in a campaign of character assassinations and a barrage of slanderous attacks from all directions. The free thinkers message itself is very seldom, if ever, disproven or even challenged; thus when your views, perspectives, and reasonings evoke such illogical and violent reactions from the elite, the masses, and “free thinkers” it's a sure sign you’re on the right path to a truthful understanding as only objective truth can cause such reactions among the somnambulant programmed masses, and the elites themselves; who of course know you're correct and therefore must either silence you as a “conspiracy theorist” for exposing their actual real conspiracy or else they simply assassinate you.
The objective answers to almost all things are crystal clear to those willing to accept facts as facts rather than ideology as facts.
A great example of the status-quo being pre-formed by the producers of ideas and then trickling down into the brains of the masses until they have absorbed it as an “eternal truth” is Stalin’s declaration that anti-Semites, not just racialists, but specifically anti-Semites be liable to the death penalty. During the biggest implementation of communism the world has known - the Soviet Union - it gave Jews a very privileged position in life, and it has long ago been verified by our revisionists as factual that almost all leaders of all branches of the Soviet government and military were Jews, and too that almost all the cannon fodder and gulag prisoners were native Russians and Europeans living under the Soviet dictatorship.
The following quote from Joseph Stalin shows how ideas become embedded as “eternal truths” in the psyche of the masses, and even long after the introduction of the idea it remains strong in the psyche of the people.
“National and racial chauvinism is a vestige of the misanthropic customs characteristic of the period of cannibalism. Anti-semitism, as an extreme form of racial chauvinism, is the most dangerous vestige of cannibalism.
I find the above very interesting considering it has always been both Communism and Capitalism which make up the two sides of the same internationalist Jewish coin; and regardless of what ruling system is in place, it’s always anti-Semitism that is one of the most hideous of “crimes” that is apparently on par with cannibalism. Knowing today, as we do, that it was the Soviet Jews who murdered Joseph Stalin I find his declaration quite humorous.
Thinking of the opening quote by Marx, one with which I'm in full agreement, it must make us think about the social conditions of our existence, and not only of today, but also of the past and the future. It has been over 170 years since Marx put that to paper and it’s quite evident that nothing has changed, nor will it ever change. So long as there remains a ruling elite of producers of ideas and contrary morality who put forth that for which we have no desire, let alone any practical necessity, and who always, nonetheless, continue to hand to us as eternal truths absolute nonsensical garbage the elite will sit upon their high-horse and have their economical, psychological and ideological slaves under full control.
 Marx & Engels, The Communist Manifesto.
A note to the reader: Here I have used material from the ideological opposite to prove a point as it shows the absurdity of the situation, which is always the status-quo of the era itself, being expressed as an "eternal law".