Douthat - you fail to highlight how he uses a logical fallacy to try to divert attention.  Thus, he inserts a comparison of eucharist for divorced/remarried after a process to Canada and euthanasia.  
First - these are completely different questions and issues
Second - his view of eucharist ignores the history of catholic tradition and sacrament understanding.  For hundreds of years, eucharist was a sacrament of reconciliation and mercy - it is not given just to those who are *perfect*.
Third - kag1982 hits another Douthat knee jerk.  He is a convert (use this term for him deliberately) and thus is threatened by John XXIII's desire to address the greatest scandal - Christianity's divisions as scandal.  Douthat sees this as black and white; church makes right.