I don't think it should have to come to killing all of them. Granted, the ones that have engaged in terrorist acts should be killed. But I agree with what Chaim says. Give them money to leave. Stop paying their gas and electricity, and stop giving them welfare benefits. On a global scale, we need to find an alternative to oil, which the Arab regimes use as Damocles sword on our heads. Take away the oil, and they have nothing.