James Watt, Reagan's Sec of the Interior, was pretty explicit about this belief. https://en.wikipedia.org/wiki/James_G._Watt

Given Watt's public pillorying, methinks the others learned to keep their apocalyptic beliefs on the down low. Mostly.

I really wish people on the "left" would learn that when people voice such beliefs to believe them, that they're not joking.

Edit: Oops. Just saw natch's reply. Sorry for dupe.