OK. But suicide => mental disorder doesn't equal mental disorder => suicide. So this doesn't support nor deny the original claim.
Actually the paper supports the other direction too, just not as strongly. I don't think the original comment was meant to be taken literally. If it was, it was especially angsty.
What is something you used to believe, preferably something concrete with direct or implied predictions, that you now know was dead wrong. Was your belief rational given what you knew and could know back then, or was it irrational, and why?
Edit: I feel like some of these are getting a bit glib and political. Please try to explain what false assumptions or biases were underlying your beliefs - be introspective - this is LW after all.