That said, I am sorry you've been burdened to the point of depression and personal struggles. It can be a natural outcome of difficult realizations and guilt, but I don't wish it upon someone for longer than necessary to make positive changes in their life (which you seem to have achieved, given your openness).
Thank you for the kind words. They were uplifting and appreciated.
- overt recognition that I have harmed someone else
- following through on whatever reparations I can make to undo part of the harm
- actively trying to change myself to avoid making the same type of mistake again.
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It sounds like you have taken this to heart.
Yes, some (most? not sure) such companies did some wrong stuff - and perhaps you were involved (you don't really say, so I'm guessing).
But the category itself? It seems fine as long as they follow the regulations related to price fixing.
When you said you caused great harm in your professional life, I was thinking more along the lines of "being a terrible person to work with", which is probably more in line with the original person you responded to was thinking.
This would be the "if it's legal, it's also ethical" fallacy.