You’re being unfair by enforcing a modern perspective, shaped by the victors, on an enemy from 80 years ago. Were Soviet weapons scientists unethical too?

You’re moving the goalposts - the subject discussed was the participation of scientists in weapon programs. He might have been a scum (I think it’s trivializing what happened in Germany at that time, I digress), but his participation in the war effort is not unethical in itself. Thousands of kilometers away, other scientists toiled on a weapon that makes all the weapons the Nazis developed seem benign.