There's a group called Citizens Commission on Human Rights that made documentaries on the subject which are really convincing. Seen their commercial one day on TV, and spent a night watching some of their material.
There's a clip somewhere on YouTube where someone went to like 5 different psychiatrists but was told all different things. Then they also had a mother tell her story about how a psychiatrist killed her son Matthew.
I already had a bad view of the industry, but after watching their content it really reinforced my feelings towards them.
Edit: Found the video I was talking about it. http://www.cchr.org/videos.html The first one on that page, It's about a hour but I think it does a great job at exposing psychiatry. I think everyone including parrents should watch this before visiting a psychiatrist