Good leaders can't be so narcissistic, and be successful. Trump is a perfect example. Almost 100% of his former cabinet is now opposed him, including the Vice President, all his former Chiefs of Staff, Attorney Generals, down the line.
If you ever had an arrogant, know it all, glory hound, grade A A-hole as a boss, you would clearly get it, too. Your own people will want to see you fail, as a result. And they will usually make it happen. Look where Trump is now. He's an enemy making machine.
As long as he makes the right enemies.