And in many cases, just not Hitler, the race known as Jews were more times than not the first target of the hatred. Lenin, Stalin, etc, also had no love for them.
The representative government and the electoral college work the same way. And both have the purpose of safeguarding the rights of the minority against tyranny of the majority. Wrong is done by an all-powerful majority as much as by an all-powerful despot.
WHAT IF INSTEAD OF LARGE AND SMALL POPULATIONS OR POLITICAL PARTIES IT WAS ETHNIC RACES VYING FOR THE PRESIDENCY? UNDER A NATIONAL POPULAR VOTE ONE RACE THAT MIGHT OUTNUMBER THE OTHERS MIGHT BE ABLE TO TAKE AWAY THE RIGHTS OF THE OTHERS, AND NOBODY COULD STOP THEM. IT HAS HAPPENED BEFORE.