I disagree with the notion that all things must be "left to professionals" - I have been let down by others more times than I can count. There are ton of abusive and incompetent therapists/psychs out there.
Personally I think psychedelics should be freely available to any human that wants them, however I'm also aware of the dangers that these compounds can present and as a society we need to be aware and prepared to face these things. That includes the awareness that one should be careful about their mindset when they decide to use such a powerful tool.
I also agree that there are incompetent professionals, but this isn't about competency. Its about preventing suicide.
medical professionals aren't interested in helping people. They are slaves to liability and insurance and place profits above the well being of their patients.
Just because some medical professionals suck, that doesn't make it safe to use psychedelics when depressed without someone who knows what they're doing with you. "Knows what they're doing" includes knowing how to handle suicidal individuals.