My response to the question is simply to state the fact that it is a pointless conversation for non-Catholics to be having.
I think non-Catholics think that if it becomes law Catholic Priests will follow it. I aim to make it absolutely clear that won’t hapeen. If nothing else, confessions will become completely anonymous so that even if a Priest wanted to turn someone in, he wouldn’t be able to. He’d have no idea whatsoever who confessed to him.
They can make it law that Catholic priests are required to break the seal of confession and it will be nothing but a useless law. It will not get followed. The Church will continue to instruct it’s priests that they are not to break the seal. Priests will continue not to break the seal. So why change the law? Unless people want to see priests locked up there is absolutely no benefit. That’s the only outcome that is going to happen with any regularity.
If they I feel they are open to it at that point I may decide to explain why priests are forbidden to break the seal. A fairly simple explanation. We believe that confession of all mortal sins is required for salvation. If someone has a fear that they will face secular consequences by confessing to a Priest, they may choose not to do so. In that case they will not have access to the forgiveness that comes through confession. Given the Church is all about getting forgiveness to the people, that is an unacceptable outcome. People must have access to confession and we are to do everything to give them the opportunity and safety to make use of it.
I may also try to show that it isn’t a “won’t” issue rather than a “can’t” issue. A priest who did this would incur an automatic excommunication reserved which can only be lifted (I believe) by the Pope. Even a secular person should be able to accept that someone who has dedicated his life to his faith in such a manner as the Priesthood requires isn’t likely to take been kicked out of that faith lightly.