Expanding on the second point: we are what we focus on. if you are practicing to be the type of person who believes people are bad you look for the evidence of bad in people. “Everyone lets me down”. To do this requires discounting and avoiding and ignoring the good that people do.

This means if you do this sort of thing you’re also not that great of a person.

Just imagine being on the other side of it: think of all the nice things you might do for such a person and got overlooked because they focus on complaining about all the bad people in their life all just to prove people are bad.