The neutrality aspect is one where I'd trust little of what the WT self-reports. 1950 and Cold War Europe. Everyone had been an anti-Nazi or member of a resistance movement. The WT rides popular political trends just as well as everyone else. Look at how keenly they've hammered the Catholic church in the past, whilst Rutherford's political overtures get the whitewash treatment.
Just to add some more suggested figures, the best I can come up with is of c.30,000 'witnesses' in Germany, c.10,000 were at one point or another imprisoned in what was a clear attempt to eradicate the religion. Of those c.10,000, c.2,000 went to camps where c.950 died. If one wants to make a comparison, one could look to the death rates of those sent to camps for homosexuality where around 50% died.
Sources: Niermann, Die Durchsetzung politischer und politisierter Strafjustiz im Dritten Reich (Dusseldorf, 1995), 295 -305, Schmidt, 'Beabsichtige ich, die Todesstrafe zu beantragen', 105-107 and Wachsmann, Hitler's Prisons, 180-183