Wow, well I guess when all else fails, point to the other guys and say, "They did it too!". The difference in this example is that the Reformers never claimed that they were infallible nor that they were the only true church outside of which no one could be saved. That distinction is all yours, FRiend.
The point is to avoid anachronism, whether it be in scripture or the Church after the NT.
And, yes, to look both ways before pointing fingers.
Plus it would boost your credibility to learn what the doctrine of infallibility actually applies to.
:)
I should add that if Dr. Luther did not consider himself infallible on scripture, the word has no meaning. Remember he added the word “alone” to scripture to support his sola fide.