Yes, police and jails are the answer, why hasn't anyone thought of this brilliant idea yet? Is it because they didn't have the foresight to make it a cute log cabin? No its because you can't enforce these laws. Say you round up all these people and put them in lockup, how long can you keep them? Eventually you have to release them and they go right back where they were. How on earth are you going to fine them? They don't have any money, you can't mail them a summons if they don't pay their fine? It's so easy to sit around and say "gee, I wonder why they don't just make being a vagrant against the law, that would stop it". At this point there isn't much we can do, tearing out the fountain helps remove hiding places, and to be honest that fountain is not impressive, especially being broken for so many years. You can try and blame the mayor but this has been a problem for decades.