Like all people, some have a sense of fairness, some don't.
The problem is that business schools teach that fairness has no place in corporate management. So those with a sense of fairness get talked out of it (most of them), and those with a sense of fairness don't get hired for management positions (because biz school said that's inappropriate).
The problem is mostly with "professional" managers - they're the ones with the MBAs.
Business schools are evil.
Corporations run by founders and family usually show a sense of fairness.