Sure, I'd patrol the town I live in now, but I no longer live in Philly. I shudder to think what would happen to a group of white guys patroling North, West, or Southwest Philly, armed or not. And, if they called for a group of white men to patrol, say, Northeast Philly, there would be a race riot. The black folks would be up in arms. Jesse Jackson would be all over the place.
Even black men patroling these areas would be at great risk, especially unarmed. If they were armed, they would still be completely outmatched. I've been to bad parts of cities all over the country, and North Philly is still the scariest place I ever saw. Just about everyone, regardless of race, is afraid to go there, and rightly so.