Would Luke Skywalker be considered a war criminal?

If the Death Star was the size of a small moon, I think it's safe to assume there were hundreds of thousands if not millions of individuals stationed inside. Does this make Luke a war criminal, considering a large amount of those on board were probably not enlisted in the ranks of the Imperial Army, instead contractors, bounty hunters, those imprisoned, etc?

I've read a handful of novels but don't recall specific troop estimations ever being stated. Of course there is moral justifications in the Death Stars' destruction. I suppose if the U.S doesn't face charges for dropping two atomic bombs, then why should the Rebels have to answer for their actions.