Your reply is the exact reason why this should not be done. The Catholic faith is based on the sacrificial  nature of the Eucharist, not a "legal" matter, but a matter of truth, plain and simple.  You espouse Protestant views.  That is what makes the difference.  By the way abortion is always intrinsically evil - also a tenet of the Catholic faith.    Why would a Lutheran desire to receive the Holy Eucharist at a Catholic Mass if they don't believe in the Catholic Church teachings?  If it was important to them, then why not convert?   Lastly only an ordained Priest in the Catholic faith can consecrate the Holy Eucharist.  That is  a big difference. That is why I am a Catholic, because I truly believe it is the one true faith.