[posterboy]

> the liberal idea that all humans are equal

This is a misconception and not what the alluded revolutionary idea is quoted by in the declaration of human rights. All humans are created equal, and I'm sure that modifier was put in not by accident, even though I couldn't explain the difference.

Point in case, one conclusion seems to be that humans are precisely not equal to each other, everybody's worth is equally indeterminate. Edit: I am biased to say this because human worth is specifically mentioned in this context in the German Grundgesetz (foundation of the law) where it's called Wuerde (dignity) and encompasses more than the capitalist idea of material value.