If he was goofing around trying to juggle a bowling ball and it slipped and smashed the coffee table next to him, I could feel sorry for him. I'd still expect him to pay for the damage.
Doing stupid things with a bowling ball and cheating on your wife and family are not the same level error. I can still feel sorry for him in his mistake. And I can still expect him to pay for the damage. In this case, it isn't paying for a new coffee table. And it isn't just writing a public letter.
The levels of trust he has violated are deep. Not just for his wife and family. He has been smoozing the President of the U.S. to influence U.S. foreign policy towards China. Do we trust this was for the best interest of the U.S.? The world? So that his company could make more money? Or for his personal gratification?
I believe in second chances. I think he can work to rebuild trust. But rebuilding trust doesn't mean you start over with 100% trust. Put him back in the mail room and trust him with small things. Then trust him with increasingly important things as he earns that trust back. Maybe someday he might earn back enough trust to regain his current position. Ok, maybe don't restart him in the mail room. But don't restart him where he is.
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All of the above is a mostly useless opinion. I am not on the board. I am not in any position to dictate anything about the situation. It is mostly none of my business. I just offer it as some food for thought for anyone trying to form their own philosophy. Consider compassion with consequences.
I'm not saying crucify him. We all make mistakes. But he doesn't deserve your sadness. His family does.
He made a horrible mistake which should serve as a cautionary tale and reminder to us ... that's all.