Title basically says it all. I've studied the Palestinian-Israeli conflict quite a bit, and it seems to be that there are atrocities on both sides. That said, from a Western point of view, Israel seems like a much more logical ally than any of the Arab nations--culturally, politically, and religiously. When did the feeling of animosity toward Israel begin arising in the West? Is it motivated by anti-Semitism, or legitimate outrage over the unfair treatment of Palestinians? As an addendum, did the Palestinian people even understand themselves as a people prior to the formation of Israel? I've heard it argued that they were too scattered to do so, and so that in some sense, the very existence of the Palestinians as a distinct cultural group owes something to Israel.
Not trying to be inflammatory in any way here, btw -- just really want to understand how all this came about.
Not answering you as a historian but questioning the premise of the question. Israel is a formal ally of the USA with large shared military activities and purchasing and intelligence sharing going on. The same with the EU. Socially and culturally Israel takes part in many activities with the west that it does not do with it's more immediate Arab neighbours. For example Israel competes soccer in UEFA and not AFC and there are many other like examples. I question how you can say Israel can be "the bad guy" in the west given the important cultural and ongoing economic and military ties between it and the west.