Israel is an ally and the opposite is not always true (Oslo, Roadmap, other suicide pacts pushed by the U.S.). In the war on terror, the two countries should be on the same page, period.
But the media will keep trying to push these "spy stories" and apparently people still happily lap them up.
These aren't just "pushed by the U.S." -- there is a sizeable element within the Israeli government itself that has long supported these types of measures.