[emmab]

I did a quick search on google scholar. Don't see any articles linking psychedelic use to suicide and there is a study of 130,000 people failing to find a link:

https://scholar.google.com/scholar?hl=en&q=psychedelics+suic... http://jop.sagepub.com/content/early/2015/02/25/026988111456...

A study failing to find a link between psychedelic use and suicide doesn't mean that psychedelics never cause suicide, it means that on average they don't seem to.

Banning psychedelics will lead to at least some deaths. Not banning psychedelics will lead to at least some deaths. This is true of many many policies.

Ultimately the question is a cost-benefit analysis.