The answer is that these evils are variants of a more fundamental evil. Good guys can't believe nihilism. They can't imagine that anyone could accept nihilism, let alone try to practice nihilism, let alone cultivate in himself a hatred of the good. Its fingerprints, footprints and feces are on every major trend of the 20th century. The two facts are related.
Every good is someone's interest, so rejection of self-interest is rejection of the good.
To deny egoism is to uphold nihilism. Nihilism is so horrific that hardly anyone can take it straight. Mutations of morality since Kant hold on to his nihilism, but hide behind pretenses of some kind of good, pretenses which have grown more flimsy and transparent over time. An early nihilist mutant hid behind the good of other men. It held that pursuing your own good is wicked, but you could rescue your virtue by serving other men's good.