You, my friend, are an uneducated lout if you think any of what you say is true.
I have never, ever, ever, ever, ever, ever, ever, ever, EVER ever met a stoner who gets angry when he gets stoned. EVER. I've known a LOT of people who get stoned, I've gotten stoned a lot, been all over the US and gotten high and everyone I know who gets high is chill as ****. Stoners listen to reggae and dub music mainly. The fact that this music is associated with peace love and happiness should have at least some kind of impact on your brain on exactly how marijuana works.
It does not induce psychosis either--unless smoked in ridiculous amounts with ridiculous potency to the point where you're basically trying to do it, and it's never a "rage". It's simply a "oh holy **** I smoked too much" feeling that, after you pass out, is gone.
Marijuana is summated in 3 words: Hungry, Happy, Sleepy. That's all it does. It does **** with your vision a bit if you're not used to it (I can drive fine high if needbe, hell I can function all DAY high, at work everything if it comes down to it), and can easily exacerbate (not exasperate) HPPD, but none of this is necessarily bad and the lattermost of which is only stimulated by previous drug use.
I really do not think you know anything about marijuana. You claim these kids think medical marijuana will allow them to smoke whenever they want--people know things come in steps. Denver, Colorado decriminalizing up to an ounce, that's a step. Medical Marijuana popping up more and more, that's a step. Once people begin to see that pot has a LOT of positives and less negatives than legal alternatives (alcohol just makes you irrational, obnoxious, and stupid, cigarettes give you cancer), then one of these days it will be legal. I'd love to see that day.
I'm not saying legalize all drugs, but marijuana has plenty of reasons it SHOULD be legalized, and not many it shouldn't.