Think about the differences between a recreational drug experience (i.e. the experiences which precipitated the psychosis to which you are referring) and taking

Think about the differences between a recreational drug experience (i.e. the experiences which precipitated the psychosis to which you are referring) and taking a known dosage of a drug in a clinical setting with supervision. Now let's visit the reality that many studies have now been completed on the clinical efficacy and potential of these medications. This isn't someone taking acid in a phish parking lot, there are now real clinical trials on a couple different drugs that were vilified by drug war propaganda that are now known to have substantial clinical potential.