A properly functioning complex system should be able to tolerate a few bad apples, limiting the harm that they can cause. If you work in such a system and there are bad apples, you can justify the ethics of your work if there are checks and balances that limit the leader's ability to harm.
The obvious analogy is the current U.S. political system. It's quite possible to see the United States as generally striving for a more fair society, and generally good, and yet to be disgusted by Trump's cruelty and inept. The only way to square those two competing ideas is to acknowledge that even though Trump is a miserable rotten apple, he doesn't really have all the power. As bad as he is, he won't last forever, and the principals of the U.S. will long survive him.
My point is that there are plenty of folks at the top of their company that are not physcopaths, they inched their way up over decades of sweat and tears, and even if they aspired to lead on their way up, they knew they had to prove themselves in every aspect of the business first. CEOs of GM and Merck are decent examples. Then there are folks who believe they were chosen for the job before their birth. I'm scared of them.