I'm just thankful those assholes are in it for the instant gratification and don't think of it in terms of long-term strategy. They want that quick path to paradise, so they just jump a border into one of their neighboring countries (i.e. Jordan --> Iraq). I shudder to think what would happen if suicide bombing became common terrorist practice here in the U.S. (and, to a point, wonder why it hasn't already).
Because they get over here and out of that miserable sandpit and realize what freedom is.