I am not the one bringing culpability into the judgement of Canon 915. Rather, it is those that argue that culpability in the sin of remarriage can be mitigated.
You do not seem to have enough understanding of the Moral Theology of sin to compose unambiguous sentences. The above paragraph is a good example which seems to have tied you in knots.
Canon 915 says nothing directly about personal moral culpability. How could it…a PP cannot know whose soul in the Communion line is graced or not. Even if he is their Confessor he cannot know this, nor is he required to.
All he can do, and all he is asked to do, is make objective judgements when necessary over whether persons are publicly known to engage in the usual examples of grave matter in an ongoing manner or state. Such objectively defined grave matter is designated in the Commandments.
…rendering the new marriage not a “grave sin”, and therefore not subject to Canon 915.
You appear mistaken. Irregular marriages are always of grave matter, of grave objective sin. Culpability or not cannot efface that reality. That is why it is called “objective”. Intentions or mitigating circumstances cannot change the gravity of the matter.
But the “malice” behind that grave matter may well be different for different couples. Clearly graced couples have no significant malice before God or man. But people are not primarily refused Communion because of their interior “malice”. They are refused because of public, outward ongoing engagement in grave matter whereby public malice is presumed unless contraindicated by other objective considerations.
…the remarriage is not a grave sin due to factors that mitigate culpability, and since there is no grave sin Communion can be administered."
“Grave sin” is an ambiguous expression for non Moral Theologians. Depending on context it can mean either “grave objective matter” OR “a personal mortal sin” (ie fully culpable).
What is not clear is how this can get around “manifest grave sin”, because the appearance of grave sin remains as the matter of culpability remains internal and hidden.
I suspect you may not fully understand what “culpability” is under Catholic Moral Theology. If as person is under grace despite engaging in “grave matter” then there is no hidden culpability at all.
Do you accept that persons may engage in the matter indicated in any of the Commandments yet still be beloved of God and vice-versa?