1. Surprised?
2. Shocked and dismayed.
3. Horrified?
4. None of the above...
Or:
5. LALALALALALALA I can't hear you. Islam is a religion of peace and Mohammed was a man of peace, Islam is a religion of peace and Mohammed was a man of peace, Islam is a religion of peace and Mohammed was a man of peace...
One in five people on the planet is Muslim.
Care to prove where every one of them is a terrorist or terrorist sympathizer? Even in the Arab world, one of the top five concerns of their populations (after unemployment, healthcare, and the corruption of their leaders) is terrorism.