yeah, post on nextdoor that this happened to you, you want to know who else this happened to because the cops are doing nothing.

The lot of you should physically go into the nearest police station and collectively file your reports so the cops know this is a recurring problem. ask to speak to a desk sergeant, that's like speaking to a manager.

you could also go the religious harassment route - tell the annoying evengelical types that this man needs jesus and he's starving and he used to be one of their members but he's falling to satan. Mormons, baptists, jehovah's witnesses, prolly not scientologists but i guess it couldn't hurt (they just want money), hari krishnas, any other annoying cult types who take anyone

You don't say where he's located so it's hard to advise you on sensory harassment -- put up lights, play loud music, etc. Search this sub for advice for homeless harassment. Know that getting him wet is the nuclear approach -- homeless people who can't get dry can get serious illnesses (infection, pneumonia, trench foot, MRSA, sepsis) and even die.

Some cities have a homeless task force. Do a google or call your health department or police non-emergency number. Say you've seen him lighting fires for warmth/cooking, there's poor sanitation and it stinks of shit, there's garbage in/around the tent, as well as the criminality you described in your post. Tell them to send two MALE social workers and police backup, if possible. Say if they don't do this, you'll mail them piss disks.