It really is not all that new. I remember seeing them around before 9/11 too.
Be careful about letting your anger towards one group turn into hatred towards an entire population. I can sympathize with your sentiments, but I also know that this is the type of knee-jerk reaction that can bite us in the backside later on. We must be cautious about small things such as this personally. It gives our enemies fodder to label us as bigotted reactionaries, which in the end only hinders our cause.
Mr. tolerant; please ask your self this: If a bunch of Christians went to pakistan/Indonesia/Egypt, and blew up their biggest buildings, and killed threee thousand Moslems in the name of Christianinty. In addition, Christian churches all over the world are preachin the killing of Moslems, do you suppose the Moslem population in such countries would allow a NY minute to pass before they would slaughter every Christian they know or find - guilty or not? If your answer, deep in your own heart that they will slaughter the Christians immediatly, then you are kidding yourself by allowing a useless thing like tolerance to enter your mind.