First, consider the stated concept of the person being "in sin."  Now, I'm writing about the innocent party in the divorce who did not cause the breakup and is the injured party.  If they remarry without yet having this church "annulment" why are they "in sin?"  What gives the Catholic church the right to punish this person by withholding the sacraments?  The Catholic church should offer comfort and help as a matter of duty to the injured party; not tell them they are a sinner.