I caught something on a current affair program within the last week. They were talking about pot and how it is different these days. They said that it is no longer the innocent hippie drug it used to be and were comparing it in the same category as the harder scarier drugs that encourage violence and prostitution.
Still seems hard to accept it is as bad as heroin and the likes but the program backed up its comments with some interesting chemical analysis that made their comments very plausible.
yeah and you know what? I saw this other program that said that Video games can lead to real life violence! It was backed up with "experts" and sound bites and everything.

I've heard the "it's 6x more potent than it was in the 60's" line too, but in the 30's they also said it would make you psychotic. I think this is the same thing. Part truth, part exagerration, and a whole lot of scare-mongering. There are people out there that are afraid of this kind of thing, so they will demonize it as best as they can to scare people into staying on the straight & narrow.
Personally, I have never seen or heard of a person being violent while stoned. I don't think it's even possible unless you're already prone to regularly violent behaviour. Pot makes you calm, and happy. On the other hand look at what alcohol does. It depresses people. Heard of the saying "Angry drunk"? Ever heard of the saying "angry stoner"?
I am not a user, though I have puffed a few at "special occasions". I wouldn't recommend anyone take it up as a regular habit (I've known people who feel a need to do it almost daily, but then it's no different than people who need to drink daily, or smoke a pack a day, or drink a large coffee every morning, etc.) Done responsibly, occasionally, there's nothing wrong with it. Just be smart about what you put into your body.