I think you’re missing the point. The people that OP is referring to refuse to use all the public facilities offered, they don’t want to sleep indoors, they don’t want to use trash cans, they don’t want to piss in mobile bathrooms or take showers, they don’t want to be corralled into designated hang out spots.

They want to go wherever they want to, camp out wherever they want to, they want to collect whatever garbage they want to and they don’t want to clean up after themselves, they want to do as much drugs and alcohol abuse in public as they want to, they want to piss wherever they may happen to be at the moment because they don’t want to be burdened with the responsibility of thinking out their actions.

This doesn’t describe every one exactly but it generally describes most that fall into this category.

Ultimately these are people who refuse to play by the rules of society. No amount of public support is going to change them because they simply do not want to change. They are perfectly happy where they are right now, doing whatever it is they want to do. Nobody can solve their ‘problem’ because as far as they are concerned there is no problem.

So understanding that fact, society needs to decide just how much of that behavior it is willing to tolerate.