Regardless of whether one sticks to the Church’s teaching or interprets AL as a change in the teaching on sex outside of marriage, we both agree that those in a state of mortal sin (e.g. from our position all those who have sex outside of marriage, from your position all those who “culpably” have sex outside of marriage) should not receive Communion because as St Paul teaches in 1 Corinthians 11:27 “whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of sinning against the body and blood of the Lord.”
We agree in principle on this point that people should not receive in an unworthy manner, but we differ on what is an unworthy manner.
It really should matter to all Catholics that we should help people to avoid sin or even the occasion of sin, anything else would not be charitable and possibly bring judgement down on ourselves in addition to the other who we fail to help. The first three spiritual works of mercy are to “instruct the ignorant, counsel the doubtful and admonish sinners”.
If you saw someone fighting in the street, or desperately crying, or ill would you ask “why does it matter to you as an outsider?” at somebody who tries to help? It’s easy to focus on the purely physical good, but Christ also called us to the spiritual good at least to the same degree. Although you disagree on whether or not these people are in a state of mortal sin, you can’t criticise the motivations of people like Tomdstone who are, from a legitimate perspective, trying to help those they see in need.