True.
> These experiences can be traumatic
Agree, but many people who experienced them still describe them in a positive light. Some don't.
> without proper guidance or in unsupportive settings
Agree. Set and setting are very important and can influence those experiences. A knowledgeable guide is essential too.
The best tip for handling a bad trip (without a guide) that I've heard is: "If experiencing something scary, go towards it and communicate with it. If that doesn't help, start singing."
There's no situation in which using a significant dose of a psychoactive substance as powerful as psilocybin is without risks. That's not to say the risks aren't worth it for anyone, and experienced, supportive guidance can minimize some risks, but it's never without any risk at all.