I can really agree with your first paragraph.
But, the second......"they do kill some, a small percent"...."the terror instilled is the real damage"......
My mind sees the towers coming down floor by floor. People leaping from 101 floors. One floor onto another down, down, down, into a rubble pile and smoke.
Lots of people lost lives that day, in the buildings, in the planes, and on a heros' plane in Shanksville, Pa. They instilled terror ........and they took lives.
Something like that, or simular, or even not simular, has to never happen again. After 9/11 there was a poll that said "80% of Americans would give up some of their freedoms for security" ......I think Americans forget too soon. I bet a poll now would be possiably, just guessing but, under 50% might feel that way now. We must always remember 9/11 and what can happen if we sleep on our issues. Terror isn't just terror.....it can be real lives lost.