auschwitz guard convicted of 300,000 counts of assessory to murder

there's an old saying that goes something like this:

“Wheels of justice grind slow but grind fine” ― Sun Tzu

Is it really ever too late?

We speak for the dead, because they can not, save through us. We demand justice, however late, on their behalf. We hold, as best we're able, those responsible to account. Should it be any other way? I'm curious to read the answers to that question...

Was this man a very minor player in the horrors of Auschwitz? Of course he was. Does that mean we shouldn't hold him accountable for his actions?