> Wierdly,monarchs seem to be the default in human societies throughout the ages.

The Roman Republic lasted about as much the Roman Empire. There have been a lot of Republic and Monarchies and I don't know which one more often that the other, but I wouldn't call it a default.

> Even our current system of government is modelled after monarchs. Supreme leader at the top, his second, close circle below, ministers below, bureaucrats below them, and finally us plebs.

This doesn't justify keeping the monarchy, actually it is an argument that we can have something that works similarly without the issues of the inherited rights.