>If you buy into the logic that repeat offences constitute a more severe crime, it's sensible to take prior offences into account even if they were persecuted under a different jurisdiction.
But Nazi Germany wasn't a state under the rule of law, so it's questionable whether someone convicted by one of its courts was really guilty of the crime they were accused of. I.e. the different jurisdiction wasn't trustworthy, so its verdict should have been ignored.