You will never make them understand that they are wrong if you continue to do that.
How do you suggest we make them understand that they're wrong?
We can't even make you understand that you're wrong.
In fact--I would bet money that you even think you're winning this argument. At the very least, you seem to be willing to keep on arguing indefinitely, and continue to press your views no matter how many people disagree with you.
What makes you makes you think terrorists are any more willing to change their minds than you are?