It's lack of materialism. Liberals think that politics is a matter of knowledge vs. ignorance, and that if anyone disagrees with them, they simply don't have all the facts or are too stupid to understand them. If someone in the Global South is unhappy about the American boot stomping them into the dirt, then satisfying them is (or rather, should be) a mere matter of showing them the graphs proving that them getting stomped is objectively the best policy. Libs rarely understand that above all, people want systems to benefit them rather than hurt them, and when they do understand it, they see it as a personal failing to be corrected.