Well you see:
-
Comparing Israel to Nazis is antisemitic since Israel is the Jewish state. Nazis don't like Jewish people, so Jewish people can't be Nazis.
-
Jews have to like Israel since it's populated by Jewish people; Israel, the Jewish state = the Jewish people.
-
Protesting Nazis is antisemitic since the Nazis like Israel, and Israel, the Jewish state = the Jewish people.
-
Nazis like Israel. Israel, the Jewish state = the Jewish people. Therefore Nazis like Jewish people.
It is perfectly logical, you just have to believe that the Jewish state is the same thing as the Jewish people while ignoring that the Jewish state, which Nazis like, is made up of Jewish people, who Nazis hate.