In a recent interview (January 23) Fr. Richard John Neuhaus, a well-known author and priest from the Archdiocese of New York (I read his Death on a Friday Afternoon as a Lenten devotional last year, and recomend it) discusses how excluding Protestants from Eucharist is in the interest of ecumenicalism, and offers an understandable rational.
Among other interesting statements, a keen observation on the general psychology and chaos of protestant churches:
‘Cardinal Ratzinger has suggestively noted that, for Protestants, the decision for Christ and the decision for the church are two decisions, whereas for Catholics the decision for Christ and his Church is one decision. ‘