On the contrary. Very very very few American Jews have dual citizenship.
When American Jews have dual citizenship it is mostly because, like me, they are immigrants. How many American Jews are Israeli immigrants?
If an American Jew emigrated to Israel he/she can attain Israeli citizenship. In the same way as an American Catholic who immigrated to Canada can seek Canadian citizenship. It may be easier and more automatic for the Jew in Israel, but the process is the same.
Dear Sabra, you'recomparing apples to oranges. You compared "Catholics" to "Jews". One is a religion, the other is an ethnic group, many members of which may not be religious at all. From what I read, a majority of Jews are agnostic now, partly due to the holocaust. But every Jew can move to Israel, and can claim citizenship and protection, even after committing crimes in their previous contry. What's it called? The law of return? Anyway, dual citizenship necessarily implies dual loyalty, and they should not be given high level security clearances.