They wanted to annihilate all Jews, and that includes me. They were slaughtering human beings as if they were lice, and that includes everyone, as well as me.
Ok I get that, that would make it personal.
well according to this he did escort folks to the gas chamber.
https://en.wikipedia.org/wiki/Reinhold_Hanning
However if you look at the footnote reference on that page , the prosecutors say he may have escorted prisoner to the gas chambers, and that charge is not one he admitted to. Not proven, though it seems he was at the gates. It is kind of hard to believe he did not know what was going on.
http://www.bbc.com/news/world-europe-36560416
So..it seems there is , on the day of the conviction already a campaign to impute crimes to him he denies. As the prosecutors could not prove that charge, it is rather fishy that Wikipedia has said it is true.
That said he did stay at the camp when he could have gone to the front. Of course being a camp guard is much safer than Russia. But he had to know what was occurring and he had an out. If he is guilty of a crime, five years seems to not be a very severe sentence given how bad the holocaust was.
I can see folks with sincere opinions concerning justice taking either side of this argument.