Bad trips can also happen to people with undiagnosed mental health issues.
You shouldn’t be giving mushrooms to people with say, bi-polar disorder, in hopes that it helps.
The reason we should be using an abundance of caution is because a lot of fucking hippie dipshits want this to be mental health cure-all when it isn’t. (I can say this because I am a hippie dipshit.)
It is very helpful for certain mental health issues, but not all of them.