This stuff is interesting, and maybe there are some people who would be moved to leave the cult based on this info. I wouldn't have been one of them, but it's plausible somebody, somewhere, would be.
I knew the org was full of "pagan" stuff back in the day. I always knew that even when I was (trying to be) a faithful jw. It is not difficult for a jw to come across that info. Golden Age era publications are available in print. I can only imagine how exponentially this availability has increased now that the Internet has arrived.
It was always explained as proof the org was fulfilling scripture about old light and new light--if anything, faith strengthening. (As crazy as that sounds.)
Back then, the average jw knew they celebrated Christmas at Bethel and had a cross as their symbol.
Masons were very common back then. Even if thee Rutherford was one, it has never struck me as important, for the reason I described.