Speaking as an outside observer, my expereince was that my US friends were not just frightened but literally hysterical. Any attempt to reason with them, to suggest that they might be over-reacting or lashing out at the wrong target, was met with reactions on the level of "WHY DO YOU HATE US? YOU'RE ON THEIR SIDE!"
It wasn't universal by any means, but the impression from this side of the pond was that a large percentage of the population simply lost their marbles.