What I wonder is whether they are aware of it or do they operate under a sort of doublethink. Doesn't someone realize that hey wait, what I am doing to them no

What I wonder is whether they are aware of it or do they operate under a sort of doublethink. Doesn't someone realize that hey wait, what I am doing to them now is what others did to us/our ancestors. Shouldn't that stay your hand instead of justifying it.