Think about it. They tend to come from already affluent families and get sent to the best schools. They never had to run a paper route or bag groceries in a supermarket to earn pocket change. They got plenty enough allowance from Daddy as well as a trust fund that ensured they'd never have to do regular work for a living like the "proletariat."
After school, they gravitated into the academic life, where they could get tenure, ensuring they'd never get fired, and guaranteed a generous income for the rest of their lives, thanks to the endowments flowing into their chosen university.
Of course they think marxism is great. They were bred from an early age to be part of the ruling class under a marxist system. Their entire lives are spent in overstuffed chairs at campus libraries with wood paneled walls doing research and such. No "working class hero" stuff for them. That's for the other dopes who think socialism, marxism, and communism are all good things.
Looks like a lot of those books were stolen from the library.