Dude, it's a city. Gangs are like sketchy sandwich shops. It's a part of the ecosystem.

I haven't heard of anything serious that the cops can't take care of. Private security is a solid business, but I think security droids might be overkill. Your market optimization point is probably going to be shields and surveillance. Preemptive and passive security will always sell well, because they're cheap enough to justify no matter what the actual threat is, and there's fewer logistics involved for the customer.

Anyway, once you get into armed security forces and security drones, the legal issues get messy fast. If there's not enough of a market to support it, you're going to blow all your capital just on your legal team. I mean, I assume you have a legal team if you're offering armed security bots, right?

[What? No, he's not giving you a hard time, Jack. He's just being helpful. So helpful!]