I think the moral question is unrelated to the legal matter (which is why he's stepping down), but I'll take the bait on the moral question.
Polygamy is not concubinage is not having extramarital affairs
Making a promise to someone of exclusive sexual intimacy and then breaking that promise is recognized near universally as a moral failing. He knew such an affair would hurt not just shareholders financially but people emotionally.
Maybe the guy isn't totally morally fiberless, but I think most people would agree that such behavior is a (non-trivial) moral failing.
Historically speaking marriage did not mean a man agreed to be sexually exclusive with a particular woman.
It meant a woman agreed to be sexually exclusive with a particular man + various legal entitlements. The particular legal entitlements were what distinguished it from concubinage (which was also a woman agreeing to be sexually exclusive with a particular man).
Now that is not what it means in a modern context, but also in a modern context nearly every developed country has below replacement birth rates, meaning that these countries are dying so any particular claims of moral superiority or fitness of the marital/family structure norms of modern societies can basically be entirely disregarded.
The idea that a man can even “cheat” on his wife is a modern idea. It doesn’t need to be “excused”. I don’t think you’re intelligent enough to really follow the discussion.
Polygamy is not concubinage is not having extramarital affairs
Making a promise to someone of exclusive sexual intimacy and then breaking that promise is recognized near universally as a moral failing. He knew such an affair would hurt not just shareholders financially but people emotionally.
Maybe the guy isn't totally morally fiberless, but I think most people would agree that such behavior is a (non-trivial) moral failing.