I think you’re making a lot of assumptions here. There are far more transplants who respect public spaces or actively volunteer in the community than are assholes. I personally find the worst offenders of destructive/disruptive behavior to actually be people who were born and raised here. Ignorant people are everywhere, but I’ve noticed they just tend to stay put.

Universities who accept more students than they could ever possibly house is another story - though I don’t know how related it is to sharing “Secret Spots” for introverts.