Many more are killed by the voluntary act of driving, but few fear driving. So why does terrorism matter enough to worry about it at all?
Possibly, you are asking this, just to start discussion? There is a difference between an organized terrorist thing, versus "random" car accidents. Also, we do have laws meant to fight car accident deaths . . . for example, seat belt laws. Also, there now is an effort to raise the safety ratings standards, so car makers can't rate their cars five stars unless they meet the new standards
If terrorism was more of a spur-of-the-moment thing, of one person here or there committing a one-time suicide attack, then the possibility of being killed by a terrorist could be more like your chances of winning the lottery, or less likely. But in the case of ISIS, this is organized and was spreading to take over the whole world. But, still, ones are doing things worldwide to support ISIS. So, if you just let this go on . . . it will go on, unless God decides to effectively stop it, in spite of ones letting it go on > "God resists the proud" (in James 4:6, 1 Peter 5:5).
But I think there are things much more damaging then terrorist killings. I mean things we can do to help to degrade our own selves. Even though we may stay alive, while we do them, still the inside damage can be worse than dying, and then we can be in a living death of worry and lusts and unforgiveness and hurts and frustration and other love-dead stuff which can keep us from loving the way our Heavenly Father through Jesus is able to correct us to love.
You can say that stopping our fear of terrorism will work. But if we ignore ISIS, then they are free to take over everything. So, do not fear them, but yes they need to be stopped. But when will this be? I understand that human effort can not succeed; we see how the United States has in fact helped ISIS to come into existence, by removing Saddam Hussein who was keeping control of that area . . . without spreading his thing all over the earth. ISIS has no intention of staying in one place. And, while others are doing their sorts of damaging and killing things, how can they expect God to honor their efforts?