After reading about their renewed plans to work on facial recognition technology, here's your friendly reminder that without IBM helping the Nazis they wouldn't have been able to plan the Holocaust anywhere near as effeciently.
Not to mention, does anyone really think the Germans would have come out and said "hey, wanna help us murder 6 million people?" Fuck no, it probably looked like any other regular government contract.
I'm not sure that being involved with the manufacture of the machinery of oppression makes one culpable for the oppression itself but it's not a good look. The practice continues in the form of arms deals with dubious and autocratic regimes around the world.