He's becoming part of the history already , and according to the past it is best to left them along as it is , besides killing them won't resurrect all those victims they've killed .
Say , you want them to answer their crime ? Alright , but to whom they answer to ?
Most people who anticipated world war II were dying out anyway , and it's not their fault that their leaders wants to wage this war (Like , they're soldiers and the only thing they can do is to follow orders) .
There was once me and my friends were evading some patrols in the school , and we hid in a public toilet and wait for things to cool down , then we found out there's a couple making out ... then suddenly one of the patrols point his flashlight at us but we were fast enough to dodge it though (damn I literary hit the deck and got dirt all over) .
After the patrols left we just sitting next to the stairs and eat our dinner calmly while the couple continues with their little "adventure" ...