Well, it depends on the hallucinogen. A "bad trip" on a powerful hallucinogen will put others at risk. Marijuana, on the other hand, is really mild, and it has a calming effects. I think most of the "links" marijuana has to crime are simply because it's currently illegal. if you made it legal, its correlation to crime would drop dramatically. To be honest, so many people smoke marijuana, saying that it has a direct cause to non-marijuana related crimes (i.e trafficking, possession, distribution, etc.) is like saying cigarettes and tobacco are also related to crime, simply due to the sheer number of people who smoke cigarettes, and a lot of them have committed a crime. Then again, a lot of them haven't.