Trust me, drug dealers anticipate people dying from their products. This was a bit too rapid a progression for true feasibility but drug dealers do NOT (and I was married to one) really sit around you know, worrying about their products and how people might die from them. They pretty much worry about going to jail and/or not using too much of their own product which might wind them in trouble so cuts happen ALL over the place with one thing or another, Higher up drug dealers IDK they seem abnormally normal except when they patrol their "neighborhoods" so to speak, they do it in bullet proof hummers, their kids go to private school, they donate to their church and they are horribly, horribly polite.
Granted, there is some in between-ness but I GUARANTEE purity of product was only valued by Walter White, and eventually, well, things HAPPENED. Etc.
But the bottom line is if you are living within a black market, there is a limited amount of "availability or caring" that is expended on other people, at really any tier of society.
Really, I genuinely promise the dealers KNOW they are blighting their neighborhoods, poisoning their neighbors, and cutting with whatever is CHEAP. They also know ODs happen all the time, you get bad product, you make errors, etc. They also live in the hope they will one day become the Hummer Driver which is about as likely (actually perhaps less) than the next Dennis Rodman. When that's all you got, though, that's all you got. Younger drug dealers and personnel are FAR more likely to get arrested, shot, etc., themselves. It's horrible.
Most folks who are on the low end of the spectrum are NOT high school chemistry teachers who were actually geniuses, who turned into CRIMINAL geniuses thanks to cancer, although I will say I deeply enjoyed Breaking Bad although IMHO it wasn't really bad ENOUGH.
The Wire? Yeah, I was living and working in East Baltimore when that came out. Trust me, I did not watch. Had no need to. None.
Anna