Is there any good reason why cocaine, heroin, and meth should be legalized?
Not really but if alcohol and tobacco are legal, they might as well be too. There isn't really any medical use for alcohol or tobacco and they have a high potential for addiction and abuse. The only differences between them all is really how quickly you become addicted and how easy it is to overdose.
Also, marijuana users don't typically infringe upon the rights of others because those others would obviously report the users for their potential offenses. Thus, smoking of marijuana is not done in places where this could happen, at least not where I live. If it were legalized, people could start smoking it in public without fear of being reported, which could have the potential to create a batch of right-infringing hyper retards running around in broad daylight.
I'd like to hear a counterpoint.
Marijuana is probably the least of our worries when it comes to altering someones behavior to a state that would infringe upon the rights of others. In fact I'd bet that stress is probably the worst in making people behave like that. And you know what helps with stress? :P
Even still, if it were legalized it would still need to be regulated. Obviously no driving while under the influence. It would probably face similar regulation to tobacco in the regard of smoking.
Also, I don't know if you are just unaware or in denial but there already are plenty of people that go out in public high. It is much easier to hide being high than it is to hide being drunk. You play the "I'm sick" or "I'm tired" or "It's just allergies" card and throw on some cologne and you can easily fool people. I'm pretty sure people wouldn't just become complete idiots if it were legalized. It's not like they would think that just because it is legal that they don't have to take responsibility for their actions. Lets also not forget how you can't really tell if someone is high like you can tell if someone is drunk. There is no breathalyzer for weed and thc can stay in your system well after its effects ware off.
And it's not like there aren't already hyper retards running around. The only difference you would likely notice if weed were legalized is an increase in areas where you smell it and an increase of seeing people actually smoking it. In my opinion the biggest prevention of idiotic behavior of stoners in public would be the paranoia they would likely get.