Good comment. But I think in this case the drugs had destabilizing effect on his mind and contributed significantly to the result. At that time he become strange and difficult to communicate.

I am a big believer in scientific approach and statistics. Note though, that studies are often performed incorrectly. For example in your link they describe "reduced likelihood of past-year suicidal thinking" and "reduced likelihood of past-year suicidal planning". But the indicator to observe before making such conclusion is real "successful" suicide cases. We need to compare a drug-using group and non-using group, and compare the number of completed suicides in groups.

For me, it would take more studies, rigid, reviewed and confirmed by other scientists, before shading doubts on psychedelics danger.