Why would you think a serious problem is necessarily simple to solve? Money for maintenance and cleanup is limited. San Francisco has legions of homeless, troubled, and then a big layer of irresponsible rebels on top of all of that. The idea that one of the greatest accumulations of irregulars and undesirables would be simple to clean up after does not correspond at all to the real scale of the problem. How many thousands of unhoused live in your city?