I really don't want to get into the details, but yes, I did things that horrify me today, including causing pain and injury to animals and other humans. This is why I don't want to get into details. These are exceptionally painful memories. I had some pretty serious anger management issues.

Note BTW that what matters here is not whether I was actually evil (I don't think I was) but whether my behavior could lead someone to think that I was and treat me accordingly. And the answer to that is an unequivocal yes. I got very, very lucky that the people around me were not inclined to seriously entertain that hypothesis.