What force keeps you bonded to samsara? Superficially, people say that there are a lot of people who love them (and vice versa), but if you analyze your life, you will find that there is no such thing as true love. I've realized that what we call love is essentially selfishness in disguise.

The strongest love in this world is maternal love of a mother for her children. But classical psychology will tell you that maternal love is also based on maternal instinct, which is endowed by nature to ensure survival of the race.

Coming out of that circle, love for siblings, brothers and sisters are more of social transactions - there is give and take, something in return for the so-called love which is given. If you don't have anything to give in return, they will be annoyed at best and shunt you altogether at worst.

Maybe, there used to be such a thing as true love back in the old days when Dhamma had a stronger hold, but I hardly see it in today's world. People say they love their spouse, but the search for your spouse itself begins with a selfish interest - Do they have a big house? What is the salary? Are they sexually attractive?

Coming back to the question, it doesn't take a genius to figure out that true love has vanished, then what force makes people cling to this wretched samsara knowing full well that its an exercise in futility? Even in the midst of utmost Dukkha, why doesn't the realization come that let me leave this path that causes Dukkha altogether? Is it the past Kamma which is holding its grip on you so strongly, that you are unable to come out of the while loop of samsara? Will past never let the present achieve freedom from Dukkha?
The force that keeps one bonded to samsara is desire. Desire for continued existence. 

"Even in the midst of utmost Dukkha, why doesn't the realization come that let me leave this path that causes Dukkha altogether"   

Because, most likely, you only intellectually realize Dukkha and unless you are enlightened , you have the habit of wanting to continue your apparent existence.

Many words, like "ignorance" are not exact and precise translations from the original Pali words. A better meaning of ignorance (in a Buddhist context) is what one doesn't deeply understand. If one only has an intellectual understanding of things like  dukkha, impermanence and not-self then one is still ignorant in the heart of those things.

People mix love and attatchment. This is just what is. It is possible to love without attatchment.

Maybe I am missing something somewhere but what does  our ability to love one another have to do with what keeps us bonded to samsara?