From the first:

This is the first documented case of Klingsor syndrome related to psilocybin, in which a psychologically disturbed person self-inflicts harm on their genitals. Plus the dude was already messed up and an alcoholic.

The second guy was on ADHD meds and hypertension meds:

Although some might be tempted to draw broad conclusions from this single case, it is important to understand the nature and role of case reports in medicine. Case reports are detailed descriptions of unusual or novel clinical events involving one patient. They do not establish cause and effect or generalize to larger populations.

It’s pretty common advice not to mix drugs unless you know what you’re doing, which is something that happened in both cases.

But the point is your “warning” is the same as telling someone about to drive or fly about the worst accident on their mode of transportation. It’s just a paranoid thought (and a dick move), not a reflection of reality.