Ok, Got your pure opinion.  I am sorry that you are not up to understanding that even us Roman Catholics must continue to grow and develop through each generation as the Spirit exposes us to new bits of truth.  There is nothing that is always intrinsically evil or always intrinsically good.  Unfortunately in the real world reality of what is happening is indeed important.  Your idea of why a Lutheran might or might not want to receive  the Catholic Eucharist is a little obscure, you see it was Christ who apparently said is all that it takes is the presence of "two or More,  He did not mentions that their beliefs must be exactly the same.  Perhaps what Francis is doing is trying to convert both sides to a deeper understanding of the more bits of truth we have all received over the generations and perhaps even he is willing to listen and be taught.