There very much is a collection of Jewish ethnicities, to ignore this is flat out wrong, btw here is the definition of Ethnicity:
An ethnicity or ethnic group is a grouping of people who identify with each other on the basis of perceived shared attributes that distinguish them from other groups. Those attributes can include a common nation of origin, or common sets of ancestry, traditions, language, history, society, religion, or social treatment.
But besides that, your entire argument flat out ignores the positions of the Ruling Israeli party over the last 20+ years. Fact is that the National Liberals and Jewish Power parties ARE in power, they DO have these beliefs, they have espoused them openly and their policy clearly shows that they mean to follow through with these ideas.
As for the last point, Israel is not America, and the Israeli system does place relevance on all the coalition partners in government, and oh ya, the equivalent of the Nazi party IS IN POWER in Israel.