It’s easy to hate the bad guys so much that we forget to love the good guys. This usually drives mid-managers and second lieutenants to become tyrants, even though they want to achieve something good.
Never hate evil so much that you forget to love goodness. In fact, it’s probably best to just love what is good and forget about evil, lest evil open its back door to infiltrate your heart.
This applies to mentoring as much as leading. Many brilliant consultants get fired. Frankly, it’s everyone’s fault when the consultant and the client forgot to love goodness the most.