Accepting the idea that our major CEOs are morally insane, or psychopathic personalities, gets easier every day with exploration. The title of this article by Steven Pearlstein is another brick in the wall:
Wall Street's know-it-alls can't tell right from wrong
All I'm saying is that it is very likely the obvious is True. Wall Street CEOs are not immoral, they are amoral, or literally incapable of weighing moral decisions. They have desires that they satisfy and there is nothing else.
In this context, what finance regulations do is protect profit for the investor from the management.