Straights have a vague idea that it might be the Commies, underworld manipulators, student protesters, and some or all of the above. Whether they're all right or all wrong, or some right and some wrong makes little difference. Maybe it's just the idea of being opposed by such a super-weapon and not being able to swallow the idea that we might be using it on ourselves. Even that makes little difference. Junk and downers are not weapons like guns or grenades that can be pointed at you and used, leaving you no say in the matter.
Junkies are junkies because they decided to be junkies.
Somewhere along the line they decided they didn't have whatever it takes to live in the same world the rest of us live in. They moved to junk-world where the only thing they have to worry about or fight for is getting more junk. Heroin consolidates all your problems into one big one. Once that decision has been made you cease to be a positive force. From there you progress to being a negative force.