Are all conservatives stupid?

Yes. They are. Eventually. Conservatives are not inherently stupid - but conservative thought processes eventually makes them stupid. The smart ones always moderate after a while to avoid becoming dumb. See the Goldwater doco tonight on HBO for proof of that.
Pope "not john paul" the first - is the latest example. Can you fire a Pope? Lordy, any moron walking down the street would have thought twice about that Islam bashing quote. Another in a fine line of conservative and far right moments - Insult one fifth of the world's population. You go, Pope! It is minor in the history of stupid or vicious conservative moments. It doesn't have the breadth of a mindless Iraqi invasion or Jim Crow laws - but it is a lovely addition to the conservative book of anal retentive idiocy.

And - as more Tucker Carlson types run from Iraq lies - remember: Liberals have been saying what you people are now finally saying FOR YEARS. Welcome aboard.