I've had that U2 song in my head most of the night, and before I go to bed, I want to link here to a post on my friend Mike's blog that I found very moving. I've struggled with the pacifism v. just war debate for years, and this post is the sort of thing that makes me want all the more actually to be a pacifist. Regardless of your stance on the issue (and the post is really not about that debate), it's worth reading.
(Ok, like me, Mike still uses haloscan for comments, so you'll have to scroll down to April 11 to find the right post. It's titled "Peace." Sorry.)