I’m a little conflicted about these trials. On one hand, “Thanks for your apology, now go stand up against that wall and put on this blindfold” is appropriate. On the other hand, he’s spent 74 years in silence and apparently ashamed of his actions, which were somewhat forced upon him by the Nazi regime, so a lesser punishment might be warranted. House arrest life sentence?
Except for the fact that he wore the 'death's head' on his uniform collar. That right there is proof of his volunterring for the assignment. It's what the SS did. He knew. And now should pay for his crime.
Nothing was forced on him by the Nazi regime. He could easily have volunteered for front line service. No German military personnel were ever court-martialed for refusing to kill Jews. He wanted a relatively cushy and safe post. Saying he's sorry now is meaningless.