Again, I'm not saying we've done all we can do. I'm not saying that many of the rich don't behave reprehensibly. I'm not saying we can't do better. But the question is: How? How can we do better most effectively? I don't think the answer is 'tax global wealth and redistribute' a la Piketty--because that's not what enriched us so over the past 200 years.

So yes, it has gone up and to the right, especially in most recent history--though, because of human folly, there is no guarantee that it will continue to do so.

Humans are inherently equalist, unless they learn to not be 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.

Peasant wars, uprisings etc show that it wasn't unimaginable, just mostly not realistic.