The arrow-shooter does have a small point to make. The Bible is an extremely candid book. When people from Abraham forward (the line of faith from which Judaism and Christianity both sprang) screwed up... there it is. In black and white. The glory is clearly going to God, who is persisting in every effort to bless a stubborn mankind. And teaching the truth that Luther also made bad mistakes would be in that very tradition. One doesn’t have to wallow in those sordid works to acknowledge that it was there. The truth of Christian worship as understood by Lutherans doesn’t depend on Martin Luther having been some kind of perfect angel, any more than the faith of Abraham depends on Abraham not having lain with Hagar (we can thank that for today’s rabid Islamic Arabs, which do far more damage than Christendom ever did in its worst hours).
I don't think he has one at all. Did you follow my linking where the LCMS addressed Luther's anti-semitism? Do that and then come back and tell me there is a specific point here, other than to have Christians whipping their backs because they prosletyze Jews.