Liability. The City has none - the taxpayers do. If the City were to undertake directing someone in how to accomplish something, are they creating employer/employee relationship? If someone cut their hand while picking up some rusty metal, would the City be required to provide medical care? Would the City be responsible because they didn't hand out gloves and didn't warn about sharp edges? If there's an area under consideration that needs some spiffing up, why don't the homeless and their advocates just get to doing it?