Nodding strongly at your second paragraph. There's really no rule of social behavior that's going to take into account all situations. Like, even the most loyal family can be forgiven for not wanting to shelter someone who's dangerously violent, let's say. And, as you note, families have never been universally there for everyone, or only with such poison pills as to make things impossible. Ideas become popular in media: for a while, it's popular in literature to dunk on small towns: havens of narrow-mindedness, conformity, prejudice--the big cities are for stimulating interactions, broadmindedness, equality. And then you get the dunking on cities: places of alienation and anomy, falseness and loneliness--and small towns are places of rootedness, mutual support, etc. All these things can be true (and none of them need to be)--it just becomes popular to highlight one type of vision or another.