As someone who has enjoyed tripping, and is generally positive about the benefits of the experience, there are a number of reasons that spring to mind. You may

As someone who has enjoyed tripping, and is generally positive about the benefits of the experience, there are a number of reasons that spring to mind. You may not have the luxury of time for that. Or even a save place to do it. What if you are in a vulnerable and insecure housing situation? Living on the streets? etc. You may not feel ready for that. For example if you feel anxious and avoidant about having a raw and truthful "conversation" with your self because of what you might find there, then it probably means that it isn't a great idea. Perhaps you don't have the access to talk therapy, supportive friends and family, and the like, to trip-sit you, or to discuss and process your experiences with after the trip. I don't think it would be fair to take options off the table because you (we) think one is better. I mean, why drink a can of PBR, when fine whiskey exists? Why masturbate when you can have sex, which is clearly superior? The fact that one proposition exists does not take the other one away. That said, with the way the laws are, one proposition IS taken away by prohibition so really it's a question of why put one of them through FDA approval to enter widespread usage while the other one sits in a weird limbo where the vast majority of those seeking it are forced in to an illicit drug trade which endangers them. But that question has a lot more to do with the moral and political failings of our society.