The writer needs to realize that Jews are individuals who do not necessarily think alike. Just because a person is Jewish doesn't mean that that person is programmed to support Israel.
There are some Jews who never supported the creation of Israel (including some religious ones who regularly demonstrate against Israel in front of the United Nations). There are other Jews to whom Israel is a matter of indifference. And there are others to whom their liberalism is more important than Israel, in their ranking of priorities.