[clusterfoo]

It's not a dissenting opinion, it's plain false. What he's thinking of is dissociative drugs.

Even at very high doses of psychedelics, you remain perfectly aware that you are tripping, and if anything, tend to be extra-careful not to do anything that might be foolish in "the real world", which you understand you still physically inhabit.

On the other hand, dissociative drugs, as the name implies, are drugs that make you lose your grip on reality (and even your own personhood). These are the "jump out the window" drugs. They can be dangerous in that sense, and also in the sense that they can be used to cause harm to others - for example, as date rape drugs.

They are not always hallucinogenic, are not the same thing as psychedelics, and they tend to be extremely unpleasant so they're not even particularly popular.

If done responsibly, about the worst thing that a person on LSD will do (assuming no pre-existing mental instability) is lie down, cry, and have a very bad time waiting for the bad trip to be over. No murderous rampage or flight attempts.

[MichaelGG]

This is not true. It's quite easy to trip hard enough to be disconnected enough from understanding some things will cause permanent damage that you won't want. For instance, thinking that blood is life energy and so is electric so why not connect the two? Additionally, the idea of death can become non-scary entirely (which can make it great in therapy), lowering inhibitions.

Perhaps it's not common to have such problems, but your key word is responsibly. It's misleading to suggest that an uncontrolled bad trip can't easily result in tragedy. (Not that that's good justification for making it illegal.)