"The rules of the game — which mirrored the rules of our capitalist meritocracy — were a setup for winning and losing. ... "
This says it all. They resent 'winners'. Anti-capitalists come in three essential flavors. 1) Those who have less and are envious (irrespective of the reasons they have less), 2) Those who have tons and are feeling guilty (usually these people are beyond being affected by the politics they champion (or at least they think they are), and 3) Narcissists who are convinced that they have been chosen to 'lead' the people to peace and harmony, and want credit for it (read 'Hillary').
Usually their guilt is well-earned because they were born rich and never did anything useful with their wealth. My boss falls into that category.
I don't think guilt is what's going on, it's really envy deflection. It's a calculated strategy to keep their riches by playing the role of "good guy" rich, supporting envy-driven leftism and higher taxes, so that the green eyed monster is their "friend" and therefore doesn't go after them.
You forgot 4) Those who know that a true classless society and perfect economic equality will never happen but it's a whole lot easier to rule at the top of the heap if you can control every aspect of everyone else's life, and eliminate the competition as enemies of the "people". Lenin, Stalin, Mao and the like fit in here. Maybe Hillary too!