Have you ever seen the amount of garbage, feces or pools of urine that they leave in public places that they assemble in? To say the least, it becomes a health hazard to the community, costs tax payer dollars to clean and disinfect the area, not only to say that it creates an eyesore for those cities and such that depend upon tourist dollars for survival.
Sure, but that is a separate issue, at least legally. Not everyone sleeping a park is crapping there and littering. So that isn’t an argument against whether someone has a right to sleep in a public place.
It’s a practical issue, yes, but practical issues don’t trump rights. So if this is a natural rights issue, and I think it is, you can’t take the right away just by saying some people who exercise that right don’t do it responsibly.