Are you kidding?? All of the purchase of marijuana on the street is illegal. Everyone selling it is breaking the law. These drug dealers use violence to control their enterprise, including beatings, murder, maiming, etc. A lot of gang violence is directly attributable to the illegal drug industry, including marijuana. Go talk to a cop or two.
That's it? The only valid reason you have is a government law which bans the drug? You know, there were once laws against certain races of people in the united states.. These laws prevented them from voting and having equal rights. Tell me, were those valid laws?
And you provided no evidence showing that marijuana growers fund terrorism, or are involved in mass violence.. Shows how little you know.
Truth is, the violence and illegal activity that does take place, does so directly because of the war on drugs. And the stuff you mentioned only happens with hardcore stuff like cocaine and heroin.. Which cause serious addiction and are pretty dangerous. Marijuana is sold by non-violent dealers. Pot is not as expensive, so it doesn't involve really involve the use of firearms or knives by street dealers.
Coke and heroin are gang oriented drugs.. The cartels of certain nations smuggle them in, then it becomes the smugglers', who themselves sell to street dealers, who then cut the drugs with fillers and sell at a very high markup. There are several parties involved, maybed 3-5 different factions.
Weed usually involves 2 parties.. The growers grows and sells it to street dealers, who sell to clients. There's no cutting or filling and the amounts involved range for $10 to a few hundred. That's it.. No violence is product of marijuana and its production/distribution.
The truth is.. Pot is not legalized because that would cut out a lot of law enforcement official jobs. Also, pot is not as ingrained in american culture as alcohol, which is far worse than marijuana could ever be.