No doubt. But they also know once they start it, we can easily turn them into the biggest ash tray in the Mideast. They're just not too sure if we will (even ODrama could be politically pushed into it though I think he won't). So, if they don't care about their people going up in smoke, they do care about how many infidels they take with them, otherwise they'd be lighting off dirty bombs already.
Let's hope we're both wrong, but I think we're both correct.