After all, other men's good means other men's selfishness. Collectivism is another nihilist mutant. Collectivism, too, is doomed by its nihilist essence. Groups are made up of members, and there is no good of a group apart from the good of its members. So we're back to plain old individual selfishness.
Environmentalism is the latest nihilist mutant.
It holds that man's good must be destroyed, but the good of other species preserved. Environmentalism, too, is doomed by its own nihilist essence. It will die when enviros see that every living being seeks its own good. Rejection of self-interest boils down to rejection of life. Nihilism s final ideal is a moonscape scrubbed clean of life.