Like most drug users, I assume, I've dabbled in dealing when I was younger although I was never very good at it, and as you would no doubt have guessed, got off very lightly. I sold pills in clubs for a while, some of them of very dubious quality that I would have an ethical problem with selling now, until I was caught by a bouncer being absurdly indiscreet and careless and after some physical (but not excessive) manhandling, intimidation and frightening verbal threats the point was made and he obviously recognised I was out of place in that world and not worthy of a more serious punishment.
That said, that particular club was known to be very corrupt and lax when it came to drug enforcement so quite likely he just ended up adding to the stash to be sold by the approved in house dealers. I also witnessed a friend of mind who did it with me (although less often) get physically mugged in a far more violent fashion and was unable to effectively intervene - in that circumstance I wouldn't have been surprised if someone pulled a knife.
I have witnessed and experienced drug related violence, of course, I'm sure many of us here have. Nothing close to kneecapping, in my case, fortunately. But it's also irrelevant to the discussion. Not having experienced any such violence doesn't and shouldn't exclude anyone from this discussion, and honestly just proves my point about this blase attitude to excessive violence being a kind of transparent bravado - "you just don't know what it's like, leave the drug world to the real men (or women, perhaps, less commonly) who understand what's needed!".
"That's just how it is", is not an argument. It's also irrelevant. I feel we're repeating ourselves now so I won't go on too much. But my position - in case it isn't clear enough - is that regardless of how it is, it's just not good enough, ideologically lazy, apathetic misanthropy to just keep saying "yeah it shouldn't happen, but that's how it is".
We obviously all know it happens. Equally, we hopefully all know it's wrong. Incessantly focusing on how people just need to understand and (perhaps - by implication even if you didn't directly say it) accept it - is no good to anyone, again it is fence sitting, ideological laziness, and refusal to take a strong moral position on an obviously barbaric crime.