Projection is nearly everywhere.
Nice kids from nice homes do charity work or advocate for "victims" and get their throats slit. They never saw it coming because it is not something they would ever do.
Crass, cynical older people know that everybody is "on the take".
What we believe about "everybody" is a short resume of who-we-are.
I am not sure what that says about me. I believe that every person is capable of great kindness and great cruelty at any given time. We are all saints and boneheads.
And while I believe that almost everybody seeks to maximize their gains, it is not possible to discern what any person sees as a gain, similar to Maslow's Hierarchy but more far more chaotic and capricious.