Why do umpires have such a huge ego?

Watch as an umpire tosses the bat as soon as a dog goes to home plate to fetch it after a player bats.

The dog, Finn, reaches the bat and the arrogant umpire picks up the bat and tosses towards the team's dugout.

Luckily Finn was able to get the bat out of the batter's circle and bring it back to the dugout. This all happened at a minor league game in Vegas.

But I ask, why do umpires have such huge egos? You are calling a ball game. All that you have to do is call balls and strikes. Let's get off the "power trip."