Here is how I view it:
How many people here know someone who died or was seriously injured in a car accident?
How many people here know someone who died or was in any way injured by a terrorist attack?
I am inclined to think that a show of hands would show that cars are far more of a threat to people than terrorists, yet we accept that risk as simply a part of day-to-day life.
Do you think we will ever get to a point where we are willing to accept terrorism as "a risk that is simply a part of day-to-day life"?