What should I do with this guy???

Violence is unacceptable however you use it. I'm pretty sure they hadn't thought of themselves as villains, quite the contrary.

Also there is nothing good or evil, but thinking makes it so.

I don't see how murdering someone over their political views is a "good way". Just because you disagree with them, does not make them wrong, or you right.

Yep you just said it yourself why the Nazis were how they were. They used violence for what they thought was a good reason (creation of the perfect Ayrian race - not entirely sure on the spelling).

Their idea of a good excuse for violence just happened to be in disagreement with the worlds view... People justify things like the annihilation of Dresden, the dropping of the nukes on Hiroshima and Nagasaki and countless other things as 'for the greater good', when really it is just violence in their own regime of 'goodness'. No matter what happens, violence for good is always violence in a bad way in someones eyes.

Do you think the people of Dresden / Hiroshima / Nagasaki who survived looked around and said "Oh. Oh joy look at all the goodness and happiness that that 'violence for good' has caused"?

Do you really think that violence can be used in a good way in everyone's eyes?

considering how this was 70 years ago all nazi(who were old enough to be nazi, "hitler youth" for the most part was german boy scouts) are almost certainly dead or nearly so by now so you'd be shooting their probably innocent DESCENDANTS for being what they are(their blood, which they had no control over)....thats sorta what "mr hilter" did to jews/ and that and the front line german soldiers didn't actually kill any jews and were drafted, had less choice in being nazi soldiers than hippies did in going to nam(which didn't stop other hippies from calling them murders and throwing rocks when they came home)

you'd be doing "genetic cleansing" like the nazi you wish to shoot by proxy by murdering their son in brazil. Its like a bloodthirsty psycho version of that restitution thing from the 80s where random black people wanted monetary compensation from random white people for something done by the long dead to the long dead).

besides if you're going to hold a summary execution for genocide china was far worse in terms of scale and success rate, and both africa and cambodia are more recent with still living members somewhere

I'm completely against execution!
Who are we to decide someone should live or die?! A human (soul) is much more complicated for you to make such a decision. I don't think ANYONE should be allowed to decide who dies or who lives. and as Jengonthanda already said, doing so will make you just like them.