You mention Daniel Pearl. He was headlines primarily because he was a US citizen and also because he was Jew. The Jewish community did all it could to promote his killing so the world could see how bad Islam was.
But if you think, the US and its partners are doing the same thing in Iraq, Afghanistan, Palestine, Sudan, Lebanon etc the list is endless. Its just that these attrocities are not promoted on the same level as Daniel Pearl. So that is why Islam and Muslim are killers and barbarians and the US & Co. well they are angels fighting the war on terror.