As far as temperament thing goes, you don't build a business to the breadth that he did by being an erratic loon.
Paging Mr. Howard Hughes.
Trump's no recluse.
sigh
You: "I don't think you could build a business if you're erratic and crazy."
Him: "Howard Hughes was erratic and crazy."
You: "But Howard Hughes was a specific kind of erratic and crazy. Donald Trump isn't that specific kind of erratic and crazy!"
Isn't there some distant, suppressed part of your brain that flickers on a big neon "YOU'RE RATIONALIZING" sign when you do stuff like this?