I argue against the private use of drugs and psychedelics. Especially against the private use of psychedelics to solve existing problems.
I argue for the use of drugs only as medicine by medical experts.
That people believe they had great insights does not mean that it is actually true. Religious people think their god is real and important. Some people argue that the Earth is flat. Some people deny climate change.
The fact that you brought up cannabis, of all things, the world's most popular recreational drug (after alcohol and tobacco), tells me that you are not quite informed.
You sound like the typical drug apologist with only personal experience that, by pure luck, was good in your opinion until today. To counter comments like yours is why I am writing this, trying to prevent needless misery created by bad use of psychedelics.
Many people use the psychiatric service for the first time because of mental disorders (e.g. panic attacks, psychosis, schizophrenia,...) triggered by psychedelics including mushrooms and cannabis.
Also, nobody is arguing that irresponsible use of psilocybin here. The person you quoted is saying that unsupervised psilocybin use is potentially dangerous. You should be careful if you have a history of anxiety, bipolar disorder, schizophrenia or similar disorders. And it's always a good idea to do shrooms together with other, stable, experienced people.
This is a better source of information: https://tripsafe.org/shrooms-side-effects/
The fact that you brought up cannabis, of all things, the world's most popular recreational drug (after alcohol and tobacco), tells me that you are not quite informed.