its not that simple; not all tweekers are a threat of armed robberies with screwdrivers.
I specifically said that it doesn't apply to ALL tweakers- but if you associate with tweakers you are gonna be in a lot of rooms with people who HAVE commited such impulsive violent crimes.
I'm not scared of tweakers on a personal level...I avoid them mainly because of the drama...but the reality is too many people I know who have had nothing to do with meth have been arrested 100% off the back of fuckhole tweakers. For instance:
* Stoner (not a dealer) sells tweaker a couple of grams out of his bag, friend of a friend, blah blah...unfortunately the guy has been robbing jewellery stores in town and the cops are all over him, he gets reported as being sighted at poor stoners house, so his door gets kicked in and our poor stoner friend goes down for supply of cannabis (had over 28g)
* Guy agrees to sell tweaker some E, tweaker says he needs to go grab cash- will be 20 minutes. Walks up road and robs service station with screwdriver, takes the whole fucking till, is arrested walking up road and immediately rats on E guy. Woop.
* Tweaker burns down flat making shake-n-bake IN HIS ROOM.
* Atleast a dozen robberies- fucking insane, turn up on your doorstep with a hammer at 3am and taking shit. The most retarded robbery of this type was for SPECIFICALLY for undrinkable homebrew.
* Tweaker holds female flatmate hostage, threatens her with rifle- holds her for about 6 hours until he's talked out. He had the shit beaten out of him for that.
Most heroin addicts here just don't get up to those sorts of fucks. I admit that most of the people doing these things are also chronic alcoholics who would be doing insane shit regardless of the drugs involved. But meth just encourages this sort of behaviour...I have watched these mopes go from being pretty reasonable people to disgustingly violent wannabe 'gangsters' thanks to nothing more than a few bowls of meth.
The question is- 'why is meth looked down on?'. The answer is simple- meth use, particularly meth addiction, has a STRONG association with crazy behaviour amongst the drug culture. I have seen heroin addicts talking all puritanical about meth while digging in their arms with needles...and from my personal experience, I've gotta give them that.
I'm not denying the violence and crime associated with ANY drug addiction- I'm simply pointing out the fact that the effects of meth are more likely to lead to violence/insanity than heroin.