How great of a man do you have to be before it doesn't matter if you are a good man?
If you are that great, why can't you also be good? Seems like someone who is nearly always the smartest in the room would understand how to inflict your leadership on others without abuse. Seems like that is what an actual great man should be.
He used people as his tools. The tools that behaved, were useful to their full extent, and also benefited all seem to like him. That is a filter system if there ever was one.
Being abusive doesn't mean you are abusive in everything or care about other interests. He held futures in his hands. Futures that would be much harder to actualize if someone decided not to take the abuse. There is a selection bias in listening to those who were successful in spite of the abuse.