Genghis Khan was arguably also a questionable human being but if I found myself at the head of clan of steppe tribemen about to square off against another clan of steppe tribemen, then I might want to know how the great Khan would have handled the situation.

hahahahaha. this is a typical mistake of melting the person and the advice/writing/work. it’s a big mistake imho. a lot of people that did do questionable things (not sure that Peter is one of them though) produced great works of art or generated ideas that are at the foundation of the fabric of our society. judge the ideas and the work on their own merits.

Depends on your priorities. It appears there are quite a few people who would happily follow his example in pursuit of rewards like he has received.

Learn to separate personal from business in this world. One can be a great person without being a good one. And vice versa.

That's a fallacy. Counterexample:

"Eat fruits and vegetables if you want to be healthy"

- Hitler