You're getting some flippant, dismissive responses, but I applaud your perspective and your acceptance of the partial responsibility you (and most of us) bear. It takes courage, introspection, selflessness, and a broader, empathic worldview. If more people were like you, the world would be a far better place. Thank you.
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).
Thankfully, it is not difficult for me to see a past version of myself in the flippant or dismissive responses, which makes them considerably less painful. I can only hope the authors are faster studies than I was.
Thank you for the kind words. They were uplifting and appreciated.
As someone who has dabbled in real estate, this doesn't sound all that bad.
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.