Easy. In the immediate aftermath of WWII, say 30 years, the generation that fought it regarded that great convulsion as: The Worst That Could Happen, while anything else was a tempest in a teapot. How excited do you get about little nibbles at the culture when you've been to the biggest show in the history of the world and you've had about all you could stand of slaughter, butchery and sheer barbarism on an industrial scale?
WWII generation was never the “greatest.” They brought in the debauchery that the Boomers ran with. The greatest generation was always identified with that of the Founders. All other generations are a pale reflection, at best.