Do they have an inflated sense of ego and/ or are they very conceited?
Just do it - Nike.
They are busy looking down on people who they think are not as good as them. They think they are smarter, more attractive and more intelligent. If they really were, they would NOT need to be arrogant!
Arrogance is on the extreme end of confidence. That means they severely lacked it at one point and very insecure.
"He who is not courageous enough to take risks will accomplish nothing in life." - Muhammad Ali
Normally because they're on a power trip and they know for one reason or another most people will not challenge them.
That thing you did. Do it again.
I agree with king - it's a compensation for being highly insecure.
Dictators ride to and fro upon tigers which they dare not dismount and the tigers are getting hungry