Questions such as that one. The tactics of the seminar posters on Free Republic. The attempts to make everyone say, "some of my best friends are...", the desire of some to shout down any information which is negative to Israel by calling people antisemites, haters and the like.
Israel is an ally and should do whatever it takes to protect herself. But that doesn't mean Americans have to drink Israeli purple Kool-Aid. Israel does not always act in America's best interest.
No one is saying Sharon is a saint. Only that Arafat is worse.