Sorry, but this point of view is little ignorant. I don't mean any offense by that, but it's seems more informed by sensationalist news than anything real life. Listen to some Joe Rogan, buddy I mean, most growers here in CA are guilty of tax evasion (maybe), but violent crime? No, not at all. That's TV, but it's not reality..
You are talking about the growers up North, not the thugs that have taken over some corners of parks, ranches, and public land.
I live in the San Francisco Bay Area. We have A LOT of open space - parks, watershed land, ranches. As a hobby, my friends and I go out hiking and mtn biking, looking for ancient Indian sites that are long forgotten, so we are off trail and in remote areas sometimes.
Mexican and Central American gangs have taken over too many of these remote areas to grow pot. They tear up sensitive environment, hose it down with the nastiest insectacides and fertilizers, poisen ponds and streams, kill off wildlife, turn beautiful areas into trashy eyesores, they leave garbage and remnants of their operation all over the place. No one hears much about it because they don't get caught and it's way off trail, but I've seen it and it's disgusting. My friends have even been shot at. We call the authorities, but most of the time they can't even find the location even when given the GPS - usually these places are extremely well hidden from the air and nearly inaccessable.
I've talked to ranchers that have been met on their own land by these thugs holding guns, and told to go no further.
So yeah, growing it is a problem too. It can't be legalized soon enough.