I really have no idea why folks continue to ignore the largest threat to humanity to have existed since Genghis Khan.
Because so many college students step into the world with the belief, preached to them by professors who have never set foot outside of academia, that communism is really all cuddly and fluffy. And if it wasn't for the evil, capitalist, military-industrial complex*, it would have already worked. And hey, it may take a few million more deaths, but they'll eventually be proven right gosh darn-it. Plus the chicks dig the Mao and Che t-shirts -- they're edgy.
*Few of them, it seems, read the rest of Eisenhower's speech, or they wouldn't throw that phrase around so haphazardly.