Well, you said the terrorists declared war, and I disagree. I also disagree that bringing fear and death over them will end it. That's what started the whole issue in the first place.
Pledging to kill the families of terrorists or supporters is just insane. For them, blood relationships are a lot more important than for us. By killing the wife and kids of one guy, you suddenly have 10 angry cousins against you. Thought till the end, you'd have to clear out the whole area ;-)

You have to stop killing to end wars.

// I still disagree. That strategy may work against standing armies in conventional warfare. But fear is what fuels the religious zealot. You cannot kill a billion people, and you cannot keep them in submission forever.
But as you said, we don't have a saying anyway. I was opposed to starting the wars, nobody cares about my opinion today. This topic is about politicians, and none of them advocates peace.