Confession is for stuff you’ve done, not are going to do. Presumably they recognize it was wrong or they wouldn’t go to confession about it.

I agree it sucks, but I also agree with the comment above yours. Yes, this crime is bad and the people deserve to be caught. I don’t trust the state to always do the right thing though. If we agree with this, we should also agree when they do the same for petty theft, assisting with an illegal abortion, or whatever other crimes they want. This is a slippery slope (not the fallacy) to the state removing protections of any confession, and these people believe if they don’t confess they’ll go to hell, regardless of if they’ll never do it again or if it wasn’t that significant.