Company shareholders should care about his lack of integrity. If he can lie to his own family, he can lie to them.

Americans should care that in a government organization, someone as compromised as him couldn't qualify for security clearance to work on as economically sensitive matters as he does. If your economy is going to be highly dependent on single individuals, and they're able to be compromised by spies and irresponsible extramarital relationships with employees, you have a huge problem.