Is Fighting "Always the Wrong Answer"?

A thought-provoking post over at The Belmont Club regarding the recent execution of Tom Fox, a Christian peace activist, in Iraq:

Can we ever simultaneously acknowledge the necessity of a deed and the absolute immorality of doing it? That in a nutshell is the Problem of Evil: that evil exists and that by and by we will have to face it. The question Tom Fox should have posed is "how do you stand firm against a car-bomber headed straight for a schoolbus?" And if you say, "shoot to save the children" ask yourself if it ever justified to be glad that God had sent someone else to shoot the bomber and go [to] hell in your stead. Tom Fox stood for his beliefs to the bitter end. And now the men who killed him are out there, waiting to kill again.