Using the witnesses' own standards, everything they offer must be pure and true or none of it is of value. If some of the "lesser" teachings of JWs are false, of what worth are the others? If it is alright to ignore false teachings in favor of true, then there is no reason this cannot be applied to other religions that have the "important doctrines" correct.
Great reasoning blue....
I have always thought that JW's since Rutherford have had a great insight into marketing, and anything that is different and seperate from (traditional) Christendom is something that they will look into and adopt whenever possible or convenient.
Thats why you can not celebrate birthdays (pagan) but wedding anniversaries are ok.
Christmas is pagan, but many JW's do something on New Years eve, even by watching it on TV. Or fireworks on the 4th of July in the USA.
You can't light candles in a KH (pagan) but you can wear a wedding ring (VERY pagan in origins)
One big key to understanding JW leadership mindset is to realize that it doesn't matter so much to them if its wrong, so long as it is different and creates a contrast they can attack.