And why doesn't it bother anyone when they do?
For instance they quote a bit from the Matthew Henry Commentary on the Whole Bible. They will use it to prove their point on something. But this same book also comments on the deity of Christ which the JWs think is blasphemy. It used to always bother me even when I was asleep and swallowing the cool-aid.
I think of it this way, would you quote from Mein Kamph if Mr. Hitler said something that argued your point?
Well, come to think of it, maybe THEY would.