If you think the average person who kills themselves with a gun is even in the ballpark of the reference class that the word “euthanasia” suggests, your intuition about the latter needs recalibrating.
Or maybe your intuition about the former needs recalibrating.
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.