Many of them are afraid of being murdered in their sleep by the terrorists.
Tell me, would you call the papers and the television stations and announce that you were going to publicly burn and destroy a Koran and then let them take pictures and footage identifying you to the terrorists?
Me neither. You and I both know that the police cannot protect us.
If I didn't have a family to worry about, I would. A couple of heads on pikes can do wonders for the resolve of would-be terrorists.