In real life many small groups of hunter-gatherers numbering from tens of thousands down to tens of persons have been in contact with much more advanced civilized nations and empires where each man was more militarily powerful than a hunter-gatherer warrior and the population outnumbered the hunter-gatherers by hundreds, or thousands, or tens of thousands of times.
From what little I known, the hunter-gatherer populations usually did not spend all their lives in fear of what the more powerful societies might do to them.
In fact, a few such situations may exist at the present time If so, a researcher could ask some of those hunter-gatherers how much they worry about attacks by the more powerful society.
In fact, members of the less powerful society might not be able to comprehend how much more powerful the other society is.
I once read a story about an Apache delegation to Washington, DC about 1876. The Apaches decided to count each white eyes they met on the journey, but they ran out of numbers. Then they tried to count each white eyes house that they saw, but they ran out of numbers. Then they tried to count each white eyes village they passed, but they ran out of numbers.
In a big city they looked out the windows of their hotel room at the crowds on the sidewalk below. 164
They thought that there couldn't be that many people in the world and they must all be walking around the block over and over again. And when they got home and told their story, the other Apaches didn't believe them and claimed that the white eyes must have cast a magic spell on them to make them see illusions, or so goes the story.
In the pilot episode of Buck Rogers in the 25th Century (1979-81), released as a theatrical film in 1979, it is said that Draconian Emperor <PERSON> is very eager to open diplomatic relations with Earth and/or to conquer Earth. It is also said that <PERSON> has conquered half the universe.
Would it really be a great "feather in the cap" for <PERSON> to open diplomatic relations with Earth or conquer Earth? Would it be a great achievement for the President of the United States to open diplomatic relations with Monaco or conquer Vatican City? The difference in the importance of the two realms is far more extreme in the case of the Draconian Empire and Earth in <PERSON> in the 25th Century (1979-81).
If <PERSON> has only conquered half of our galaxy he would rule about a hundred billion solar systems and have Earth outnumbered billions to one. And if <PERSON> has conquered half of the universe he would rule billions of galaxies.
But most members of the educated audience of <PERSON> in the 25th Century (1979-81) didn't scoff at the idea that Earth could be a prime target of the Draconians, because to most Earth people Earth seems at least as important as every other planet in the universe combined.
So I guess that most future Earth humans in the OP's scenario will not be too worried about the all powerful aliens known to exist. They will subconsciously think of Earth and its solar system and colony planets as equal to the rest of the universe combined. 837