Sigmund Freud captures the disillusionment of those who in the early years of the twentieth century embraced the liberal view of man as inherently good, a Promethean shaper of a glorious future, an Olympian god:
Sigmund Freud --On Transience
Those earlier humanists who thought man to be the closest thing to divinity in the cosmos were devastated by the horrors of WWI. The same thing happened when the full extent of the holocaust became known after WWII, and it happened again when the crimes of totalitarian communism were exposed in the second half of the last century. Yet the project of deifying man is resurrected every generation. The liberal, humanistic faith that man can be his own deity, that he doesn't need a transcendent God, that he can create heaven on earth all by himself, is as irrepressible as it is manifestly false.