Dogon, The more relevant question is why were Jehovers Witnesses in the concentration camps in the first place?
The answer has to do with property ownership. If you do your research, you will find how Judge Rutherford fully supported Hitler and " YES" wrote Hitler letters praising his policies against the Jews. It was only after Hitler confiscated " Kingdom Halls" in Nazi Germany, that Rutherford decided to write very " Rude" letters to Hitler.( i.e the letter recorded in the year book) and this is why " German" Jehovers Witnesses ended up in concentration camps.
I will find the relevant documentation to support my statements, unless more administrative members have the information to hand?