I don't support this sort of invasion of privacy, but FWIW most terrorists are grossly incompetent. We're not dealing with shadowy cabals of Dr. Evils, terrorists we've been able to apprehend have inevitably turned out to be strictly amateur.

What they lack in operational sophistication they make up in dedication and deadliness.

It's not going to help them determine how much of a threat someone is in terms of killing people. It's a very good way of determining how much of a threat someone's likely to be in terms of drawing attentions to the less savoury aspects of Israel's treatment of its Arab population.

Edit: Good guess apparently. Look at the search keywords here: http://mondoweiss.net/2012/06/do-you-feel-more-arab-or-more-...