Replace "suicidal" with "suicidally depressed" and I'll agree.
Depression isn't always chronic, and when it is, you aren't depressed the whole time. It doesn't seem clear to me if a depressed person committing suicide is on average a net loss or a net gain.
I suppose I should have made my position more clear in my earlier comment, and said that that could just as well be a cost to gun control.
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.