First of all, Israeli government =/= the Jews. Shiranu said it, but it's worth repeating.
Second, the fact that the Israeli government has perpetrated false flag operations does not mean Jews did 9/11. The U.S. government has perpetrated false flag operations as well, and other breeds of truther have used this point to "lend credence" to the notion that the Bush administration was behind 9/11. Without any actual evidence that 9/11 was a false flag operation at all, or that Israel had anything to do with it, the fact that such-and-such government was behind a false flag in the past is completely irrelevant.