I wonder if the supposed dangers would be lessened if it were legalized? I say supposed because I've read so much conflicting information. I do think the comedown can be brutal for some people, though I guess there are things one can do to cushion that.
Jumping off from that: I'm not a fan of any government legislating about what I can and can't put into my body. Hate to trot out an old chestnut but it's amazing to me that cigarettes, which indisputably cause many types of cancer, are legal. Smoke as many as you want for as long as you want and suffer the consequences. While other substances, which people might only ever use sparingly anyway and don't have anywhere near the harmful effects, are outlawed. Apart from alcohol and tobacco, the only drug that has ever killed someone I've known was a well known cholesterol lowering medication.
Steve Jobs called his LSD experimentation one of the two or three most important things he'd ever done in his life. He reportedly said that people who hadn't shared that kind of experience couldn't fully relate to his thinking. I really think some experiences can be that powerful. It's annoying that people's experimentation is limited. I'm certainly not an aficionado, but if some things were legal I would definitely be using them to open my mind and go on my own quests.