A majority of soldiers were not even members of the party. Nazis were never the majority party, until they took over everything.
The time to mete out justice has long since past, and this is just vindictiveness.
Why not try and execute all surviving U-Boat crewmen? The slaughtered merchants by the thousands. And if that is the case...why not all the factory workers that made war material? The legal term assessory really opens the aperture. Who made all the logistical deliveries to the camps?
It is ridiculous to state the guilty are only those stationed at the camp.