Not sure this analogy adequately adds up anymore so than you are saying my analogy of agnostics going to Mass with Catholic friends adds up.I do get your point. Responding to it more specifically with a more extreme analogy, one can’t fully express ones disapproval of an abortion, while driving someone to the clinic.
An abortion will not happen without being driven to the clinic. A person who drives someone to an abortion clinic has actually helped the abortion to occur.
Is Mom not attending the invalid wedding going to stop it from occurring? Not likely. Is Mom refusing to pay for the wedding going to stop it from occurring? Maybe, but then you’re back to daughter getting married in the Church just to please Mom and we’ve already discussed why that is problematic.
Furthermore, the Church makes it clear that anyone who participates in an abortion in anyway has committed grave sin and will be excommunicated. The Church has not explicitly stated that anyone who attends an invalid wedding will be excommunicated. (Not sure if abortion merits automatic excommunication anymore, but it did at one time.)
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