Was the JFK assassination the turning point?

Edward B. Driscoll Jr. suggests that liberals got "trapped in Camelot" when they couldn't accept that a communist shot JFK and that they subsequently went "off the rails."

However, if one looks back at the 1930's, one sees liberals were praising and apologizing for Mussolini and Hitler. If one looks back at the 1860's, one sees that liberals were taking the wrong side of the civil war. I disagree with Mr. Driscoll: I see no evidence that they ever were on the rails.