People have no choice but to smear feces on the wall and leave needles on the floor of public restrooms, or urinate inside a moving bus because housing is too expensive?
Housing and wealth inequality is an undeniable issue. So is anti-social behaviour. You can be poor and even homeless without throwing self-respect out of the window. People are either responsible for their actions, in which case criminal and civil charges are on the cards, or they are not (due to mental illness and/or substance abuse) and need to be institutionalized.
When the social contract fails you, why pay any regard to it at all? It's not a matter of pure, exogenous choice to do those things. It's not some abstract preference that surviving in the margins has afforded the freedom to exercise. It's a way to make sense out of the world and to have some shred of a sense of agency in a world where a person otherwise has no power.
No, it's mostly severe drug addiction and mental illness.