Those people may be (as you said) 'theologically illiterate ', but you seem biblically ignorant. Read the Synoptic Gospels: this corpus does not explicitly state that Judas Iscariot received the Eucharist at the Last Supper, but this is its undeniable implication, since none of its constituent Gospels excludes his presence from that gathering.

If Jesus did not deny even Judas his body and blood, how dare any priest, bishop or pope even consider doing such an arrogant and ungenerous thing.