This all seems massively flawed, I'm aware of the capacity for this stuff to be a moral panic, I don't believe that music itself makes people violent any more than say violent video games. The issue here perhaps though is the culture surrounding this type of music, that lots of this stuff relies on the reputation of the individuals or groups creating it. It doesn't appear to be something that is necessarily conditional on raw musical talent, rather if you're a member of a known gang and that gang has some credibility then that seems to be a significant part of the marketing in the drill scene ergo it seems pretty flawed as a way to escape gang stuff.