Watersprout,
If you show them the Rutherford Christmas photo the only thing they can say is, "New light."
But I bet their eyes will pop out.
They probably have no idea that Rutherford and company celebrated Christmas at Bethel.
You might say, "You mean the FDS didn't know about the Saturnalia pagan origins of Christmas in [whatever year photo you're using]? I thought they understood the deep things of God."