Earlier quoted context omitted.
Terrorist attacks are defendable against. But anyway, you don't need to defend against terrorist attacks as much if you convincingly show terrorists you can come to their home and blow it up if they try.
I think you fundamentally misunderstand the strategy of terrorists. They are looking to provoke a violent overreaction in order to radicalize the populace. It is a response to our ability to blow them up, and not one we have developed an antidote for.
A radicalized population that has had their infrastructure and military destroyed isn't much of a threat.
Sucks for them, but the problem is still solved for other nations.