Interesting thought. Contrast arrogant with confident.
It seems to be that the truly arrogant (Levin, Obama, Rush, etc) are deeply insecure. The truly confident (Hannity, Trump, etc) are very secure in their egos. They know what they are capable of and believe in themselves. They wont be bent by others because they have a strong core and will stay the course.
The insecure people who act like they are better than others ARE THE ONES WHO WILL KISS BUTT because they need adoration and approval. That sums up arrogance and why it is proof of dangerous insecurity. As bossy as they seem to be, these people are dangerous to put into positions of power.