“How does that make Donald Trump any different than the average American?”
The last time I checked, neither Schumer, Pelosi, Harris etc, nor the “average American” doesn’t have anywhere the degree of narcissism as Trump which makes EVERYTHING about him. If he is not the biggest, the greatest, etc. he goes into a frantic counter-attack mode that even Republicans acknowledge is scary at times.. Most important to the original question (aka “how is he different”) the answer is that he has the nuclear codes and as we have seen repeatedly, is prone to act impulsively. In his last term, there were adults in the room to buffer his crazy impulses. The next time around, there may not be any adults in the situation room and he will be surrounded by Steven Bannons, Peter Navarros, etc.