I'm not sure we should expect people to not be people just because they have their political/ideological homes somewhere on the left of the spectrum. I'm largely with Steely on this one, because his explanation explains not only anti-semitic rhetoric on the left but also similar rhetoric (directed towards other groups) among conservatives, authoritarians and old-fashioned xenophobes here in Sweden. I hope, though, that, if these people were asked if they advocate ethnic cleansing, some of them would be given some pause.