No need to assign ill intent to the field of psychiatry in regard to brain scan studies. The sorts of research errors they likely are making are actually common throughout various fields. Lack of preregistered studies / publication bias, lack of control of confounding variables, mistaking correlation for causation, various forms of statistical fudging—mostly these things can be explained by sloppiness, the academic publish-or-perish mentality, and the genuine difficulty of performing quality research that leads to robust causal conclusions. I’m not saying there aren’t bad actors. And yes, the incentive structure for researchers is largely messed up, rewarding quantity over quality. But I think mostly it’s genuine mistakes and lack of understanding that lead to these sorts of problems, and not just in psychiatry. I will once again recommend PubPeer and RetractionWatch as places to get insight into the kinds of problems afflicting scientific research today. Deliberate fraud exists, but so do many other problems.