This is just stunningly naive, sorry. You're imagining a bunch of noble professionals, but in practice in history when you give a bunch of people weapons and tell them to police their neighborhoods, and ESPECIALLY when you make them accountable only locally (to the people paying them, in this case) and not to society in general...

You get gangs. That's how gangs form. Organized crime, almost everywhere, has its roots in this kind of "local security" of an underserved disadvantaged population. People who can't rely on the police for order end up under the thumb of whoever can provide stability.

Now, OK, sure. I get that you're thinking that somehow this startup has found a growth hack to disrupt this millenia-old industry and do it better than the Mafia. Well... maybe. Or maybe it's just another gang.