If you grow up with no experience of not being stepped on, exactly what would you be giving up on? How exactly do you expect people on average to not accept the general state of the world as it has been for their entire existence?

Acceptance is the default. People, by and large, often do not have the experience of holding ideals of which to give up on that do not in one way or another map onto their experiences in a way suggesting they are living in-line with their ideals.