Moral justification for the execution of criminals of war?

[Silver]

But according to the OP, the argument doesn't regard the guilt or innocence of your average Tom who is being judged by a jury.

We're talking known war criminals. They value their lives more than those whom their exploiting and killing, which tells me they are undeserving of a right they are denying others.

There are varying degrees of barbarism, after all, and some people don't deserve to live.