Frankly, I think we all have a bad manager inside of us, and the problem is that being put in a manager position exposes you to humanity-draining incentives that feed the bad manager parts of you, until it defines you. Higher compensation and promotions for focusing on costs and not quality, and short-term gains rather than long-term stability.

If you’re unusually self-aware and smart, and put effort into grounding yourself, you may counteract it, but most people probably just float through life and let those incentives define them and their choices.