It's a variant of state's rights. Basically up until a generation or two ago a lot more people lived in a medum-to-small town. For a lot of those people, the cities were strange places of violence and grossitude. Full of corruption, and evil.

The idea that they would also make all the laws was unthinkable. "Why - they'd let the gays marry! We know there's no such thing as gays!" and so on. (Although practically speaking - where the political rubber met the road so to speak - it was about being allowed to keep humans in concentration camps for money.)

So, back before we knew how conception worked or what an automatic rifle was or even that we were one small part of a larger group of stars called a galaxy - they developed the Electoral College to ensure that everyone had an equitable say. That, and the Senate having exactly two representatives no matter how many people lived there. From a political point of view, it was reasonable at the time.

Fast forward to 2016 and batshit insanity is literally trying to topple the government in a demented coup attempt and it starts to look less like a good idea.