So I guess the lesson here is that you shouldn't blame yourself too much if you've done something that feels obviously wrong in retrospect. That decision was made by an earlier version of you. Although it feels obvious now, that version of you might literally have had no way of knowing that it was making a mistake, as it hadn't been properly trained yet.

I suppose this does not seem to apply when you do stupid things when you are under negative influences. Fatigue for example. I make faux pas all the time when I haven't slept for more than 30 hours.