Government policy encourages homeless people to congregate in public areas twice over: first, cities destroy access to very-low-cost housing. Second, city governments often refuse to enforce their own rules of public-space use. Tent cities result.
In addition to having no obligation to intervene to protect the public, government law-enforcement agencies are protected by many layers of formal immunity which allow them to both abuse their power and neglect their duties without any significant repercussions to themselves or to budgets.
In two recent cases, Neil Gorsuch joined the "liberal" wing of the Court to side with Indian tribes in enhancing tribal sovereignty. This is a good thing for limiting and decentralizing government power.