A father's authority comes from the fact that his child hasn't fully developed mentally and has limited experience and knowledge of the world.
If you're saying that adults have the same deficiencies, then you must explain where you expect to find these superior beings that SHOULD be running our gov't..... and you'd have to explain why we are letting mere humans run the show while your looking for superman.
Saying,"people are evil" is no justification for letting said people have power over others. It doesn't even make sense. Fear of your neighbor, which is real, can be used to logically justify a gov't, though, but, without that fear, it has no purpose. It's nothing more than a parasite.
"I do not add 'within the limits of the law,' because law is often but the tyrant's will, and always so when it violates the right of an individual."