It doesn't matter if they are in prison or out on the streets, they are gang bangers 24/7/365.
They are vermin and being predators is all they know. They have no culture, beyond what could be likened to a colony of cockroaches.
I am not for killing them or anyone else though.
Britain was really onto something 200 years ago with the deportation of their criminal element, sending them all down under and unceremoniously dumping them there on the beach to fend for themselves on the other side of the world far far away from the shores of England. We should emulate that.
I'm all for deporting the entire population of gang banger animals, and I do mean all of them from the southernmost tip of South America all the way up to Prudhoe Bay, to Iran.