Problem with that theory is that long-time Catholic doctrine -- and St. Paul himself -- make plain that if you eat and drink unworthily, you eat and drink damnation unto yourself. A priest should not be helping a parishioner to damnation.
You may well be absolutely right that that's what some weak-spined clerics may be telling themselves, but what passes for 'reasoning' among liberal and heterodox Catholics is pretty lame.
1 Corinthians 11:29
For he that eateth and drinketh unworthily, eateth and drinketh damnation to himself, not discerning the Lord's body.
Canon 915
"Those upon whom the penalty of excommunication or interdict has been imposed or declared, and others who obstinately persist in manifest grave sin, are not to be admitted to Holy Communion" (can. 915).
"Are not to be admitted" means exactly what it says. It is the duty of the pastor, and/or of the Bishop (chief pastor of the Diocese) to apply this canon. There is really no wiggle room.
(1) Most Bishops are acting in flagrant disobedience of Canon Law.
(2) The Sacrament the Holy Spirit is calling the obstinate public sinner to, is the Sacrament of Confession.
Divorced and remarried Catholics without an annulment cannot receive Communion either.