[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.)