I have some pretty strong feelings about what is going on in Israel right now. I am absolutely horrified at what Sharon and his government are doing to the Palestinians. (In my opinion, with the assistance of the US government.) However, to answer your question, I will come right out in the open and say that Synagogues should never be burned. Ever. And no violence should be committed against any Jewish people anywhere in the world as a backlash for what Sharon and his government are doing. Period.
I think there is enough shame to go around without creating reasons for any more. We're all just people. That's all. Just people.