If you don't live it, don't rap about it. If you talk about something enough, it will eventually come to you. It could be a rapper that happens to be a hard fuckin' dude, or it could be some regular street cat that catches one of your shows and decides to test the size of your nuts in the parking lot.
Fact of the matter is, when you're on top or on your way there, a lot of cats will do anything they can to discredit you and bring you down. So, it's in a rappers best interest to be themselves, and not contribute to the bullshit. On top of that, it's just plain dangerous for a square to talk about some gangster ass shit. It's entertainment to the listener, but it's real life in the streets.