I wouldn't even consider most psychedelics bad and I even consider mushrooms instrumental to my alcoholism recovery over the last few years. (There are caveats, and I'll explain.)
The issue is some people simply cannot handle psychedelics and bad trips can do more harm than good. If someone is in a risky spot or around shitty people, that can amplify bad experiences 100x. I have had several bad trips, and it's easy to understand why full-blown psychosis is sometimes a thing.
Heavy dosages with inexperienced users that already have issues is a recipe for disaster. Period. Having seen reality completely dissolve a few times myself, it could be a seriously traumatic experience for some people.
However, when used and dosed properly in healthy environment around people who truly care about your well-being, the benefits outweigh the risks in many cases. A person can quite literally rewire their brain and start to heal from depression, anxiety, PTSD or other types of mental health issues. I ain't gonna lie: I thought this was absolute bullshit until I started to actively work to sort out my own issues.
The best part is that psychedelics are mostly self-regulating and a tolerance is formed lightning fast. If you are crazy enough to want to trip several days in a row, it can get super inefficient, super quick.
For the first few months of alcohol sobriety, I was going on some universe hopping adventures, having multiple breakthrough experiences and having a grand ol' time. Then, it just slowed down. I don't know how to say it accurately, but I found what I was looking for and was able to resolve some deep inner conflict.
I still trip on occasion, but at fractions of my previous dosages. I don't need those deep experiences any more and I can continue my recovery at the speed of reality.
Psychedelics aren't inherently dangerous, but they are extremely powerful and demands serious respect. Alcohol is just straight-up dangerous. There are people in my life still that are still killing themselves slowly with the stuff and it sucks to watch.