You might be surprised how many people fail to put two and two together, e.g. Islamic doctrine and Islamic behavior = intolerable threat to the rest of civilization.
The mandatory reading for them:
From recent trial of Abu Hamza terror mastermind:
"He went on to tell his audience that there was no liquid loved more by Allah "than the liquid of blood". "Whether you do it by the lamb, or you do it by a Serb, you do it by a Jew, you do it by any enemies of Allah," he said. That drop of blood "is very dear".