The treatment of mental disorders with drugs is not the same sort of activity as the use of drugs in medicine. The ethical implications of the two situations are different. Insisting on equating the two obscures these differences and presents the use of drugs for mental distress as less controversial than it actually is.
Psychiatric drugs can’t address isolation, poverty, inequality, racism, intolerance, hatred, bigotry, sexism, etc., but they can mask those things. Perhaps that is why they are so successful. The blame is placed on us, the patient, for being broken because it obviates the need for powers that be to take any action to address those underlying causes of distress and suffering.