Over some wine and cheese last night, an Oxford educated, local retired Greek cardiologist and I pondered a variety of things, large and small. In a semi-joking way, while discussing the differences between American and European socio-political culture, he said that in the area of lunatic fringe violence, America seems to have it backwards. In Europe, it's the left wing fanatics that are known for violence and assassinations. Conservative political leaders need greater security than left wing ones. In the US, he observed, it seems that right wingers are the people to fear. He, as do most Europeans, fear for an liberal, African American President's safety.
Paul Krugman seems to have the same view!