The campaigners began planning the lawsuit after U.S. author Edwin Black wrote in a 2001 book, IBM and the Holocaust, that IBM punch-card machines enabled the Nazis to make their killing operations more efficient.
That's like suing the car dealer for selling you a car that "makes you more efficient" in causing deaths due to your driving. Worse, it's like trying to blame Ford or GM for building better cars to make you a more efficient drunk driver.