So human... a beautiful mountain before you, and first you worry about the pile of shit blocking the first step. Step over it, or your trained helplessness makes you useless.
Cities can be rearranged. People can move between buildings. Big cities can split up into local communities, like they're already doing as a buffer against crime (98% of which is committed by minorities, drug addicts, and mentally retarded homeless). All these things are easily surmountable.