The reason I don't have any great struggle with it, is that my conscience is clear in this regard. Yes, it is a problem for the world and I've been on the stop the war marches. However the teaching of Christ is clear and unambiguous.He said love your enemies.
You can't do this by killing them. Christ had no dilemma here.

If people want to make the world a better place, they should try and start doing some good in their own communities rather than raining down bombs of mass destruction on some poor buggers in another part of the world.