There's no moral argument against killing members of a genocidal fascist military, sure, but there is a realistic one and its that you cant just kill...

Gosh darn it I'm glad someone said it before me. I'll admit to a bit of red-tinged fantasies myself, but until that moment when it's my choice to pull the trigger and end a humans life i don't know that i could.

We don't know what this guy's job was. For all we know about him he not only might he not have the training to kill another soldier, he might not have the will. Maybe he values life highly. I for one give him the benefit of the doubt cuz whatever his convictions were, he held them tightly and paid for them with force and will.