Why is it bad for a government leader to act in an arbitrary (random) way or in a way that is only good for the leader?

Why did einstein write a letter to president roosevelt

In a modern democracy all elected officials serve for a certain number of terms then must retire a high school sophomore and a senior citizen may vote at the polls together a united states senator votes on immigration law on behalf of your mother through indirect ballot all democracies have a two chamber system of representation united states citizens live in a direct democracy

This civil war battle took place in northwest georgia in september 1863, and, following over 30,000 casualties in just two days, resulted in a confederate victory.