These are not microdosing experiments though. The usual way it is handled is that you get a few weeks of CBT then you get half a dose and the following week you get a full dose followed by more weeks of CBT. There is no placebo effect here that's possible because, well, it is impossible for someone to believe they have taken a full dose of pscychodelic drugs and not feel anything. But you still have a control in this case because you have a group that goes through CBT and another group that goes through CBT + drugs.

In fact, from these studies there have been very little "bad trips", mostly I guess because you have the half-dose session and then the full dose session in a very controlled environment and so on. These experiments are obviously done quite responsibly.

So I think you're mixing things up a little bit and I would suggest doing a little more research in the topic. Psychodelic therapy, at least the kind that is being explored seriously is not really done through microdosing.