I don't blame the pointy earedness. I blame the people that wrote the characters. Meow.
Probably just a correlation rather than the causation. The arrogance might be more attributed to their high intellect, which is just high enough to make someone feel superior but not high enough to make them humble.
Maybe they feel like they have a point to their-
I'll stop making puns before I even start.
The matter for the pointyness is taken from their brain matter.
Pointy ears. Upturned noses. Flying toupees.
It must be an immunity to gravity that causes air-head-ism.
Separate names with a comma.