And there are shot tons of videos of Muslim buildings being blown to smithereens. But shock value of a beheading is way above that of a building being blown (other than WTC).
I bet you for every American killed there are 5 or more Muslims killed.
Before everyone gets their panties in a bunch, I'm not saying the Muslims are the good guys or anything like that, just that violence is seen by each side as the other side is the culprit and they're retaliating... And round and round it goes and the more it escalates the easier it is to recruit.