Pride. They know all things and will be the highest. Those who can't create... destroy. They attempt to wipe out history and cultures. Same beast, different name. They have thrown down the gauntlet. When it's the Pieta, David or the Sistine Chapel, they will celebrate; When they get to the museums, MAYBE the rubes will realize it's Western civilization they mean to wipe out. As Mao said on the parable of the Monkey King and Princess Iron Fan... She was formidable, but he turned himself into an insect, then infected her from inside.
On Fulton Sheen:
Where, he asks, did the philosophy of Communism begin? Not in Russia, but in the Western world of the last century. It is western in origin: its philosophy is German, its sociology French, its economics English. Karl Marx, its founder, patched the dialectics of Hegel on to the materialism of Feuerbach, to the sociology of Proudhon, to the economic problems born of liberalism, and out of it came the new gospel which has now turned upon its creators to torment them for the past.