All of those traits are quite common. Paranoia and violence are big issues. Society has problems regulating things that occasionally go wrong. For instance, mo

All of those traits are quite common. Paranoia and violence are big issues. Society has problems regulating things that occasionally go wrong. For instance, most drunk drivers make it home. Most cigarette users don't get cancer-- and if they do, it takes several decades. Most sugared soda drinkers don't get diabetes right away. To me, the idea of a responsible heroin user falls into the same camp. Sure, some high functioning professional may be able to coast along taking it casually. But usually, the heroin users get sucked into some vortex, perhaps by a problem in life or something else. There's a reason why there are so many overdoses. All of those users used to be responsible. Then one day they weren't anymore.