The point is that people have been decorating trees with silver and gold ornamentation since long before Martin Luther was even born. I'm well aware of what they were doing (Astoreth poles and such). Even just a few centuries after Martin Luther, there were people who considered the decorating of trees for "the Christ Mass" (Christmas to you and me) to be a pagan tradition. Why would they even come to this conclusion if there was not a historical track record, so to speak, for this?
Over the years, Christians have adopted and then "Christianized" many things and traditions that, frankly, would have likely shocked the Apostles and early believers. Does that mean that it is wrong in all cases? Probably not. It's all about where your heart is on the matter; who are you intending to honor?