Such laws should be enforced, they are good laws that benefit almost everybody. If somebody has a mental illness that renders them unable to comply, they shoul

Such laws should be enforced, they are good laws that benefit almost everybody. If somebody has a mental illness that renders them unable to comply, they should be permitted to receive treatment in lieu of legal punishment. If they prefer not to be treated, treatment should not be forced on them but they should instead face the normal legal punishment for their crimes. And of course, funding/supporting programs and regulations that reduce the scope of the problem is a good investment. This likely entails providing housing to people to preempt the issue of those people trashing up public parks. But the laws against that sort of behavior will still be necessary because some people will choose not to avail themselves of those programs and will behave antisocially no matter how much help you try to give them.