Two questions:
1. When someone joined the Waffen SS was it clear that they would be killing Jews or committing war crimes or was it viewed as we now view the difference between joining the Army, FBI, Marines or CIA?
2. What happened to members of the Waffen SS or member of other branches of Nazi Germany who objected to performing particular duties?
In my mind, if he had a reasonable out whenever he realized what was going on, and didn’t take it, he’s a war criminal. If when he realized what was going on, he also knew that any objection on his part would lead to his certain demise, it’s hard to hold him accountable.