What is it that you fear Aunty?

A 'dirty' bomb or other WMD that is snuck in by some small terror group?

An invasion by the several thousand members of such smal terror groups?

How do you see them attacking our soil with enough force to kill 4million people? Since the radical terror groups are only small fractions of the muslim societies, they won't be able to come up with the sheer man power. Besides, how will they get here? They don't have a navy or air force. I guess they'll just have to rely on WMDs...