Absolutely.
. It can be reasoned, articulate, loving and caring warning of the very real danger their souls are in.
Have you ever explained hell to someone in a loving and caring way?
I try to use the "why buy the cow when you're getting all the milk you want for free" arguments. Lots of the younger couples are living together just because they can, or because one or the other wants to get the hell away from their parents.
They know they shouldn't be living together; I add my voice to the priests in the Parish (all of whom discourage it), and hope that they hear it.
No, but I've never been in the unique position of ministering to Catholics in preparation for their marriage.
I did, however, recently inform one of my best friend's that he was putting his eternal soul in peril by willfully seeing another woman while he was separated from his wife and the woman he was seeing was separated from her husband. In fact, the only reason I didn't punch him in the face to wake him up was because he was in Pennsylvania, and I'm in Hawaii. I had asked him to be a godfather to my daughter, and told him that unless he immediately broke off all contact with the woman, I wouldn't let him be my daughter's godfather after all. He called me the next day to tell me that he'd gone to confession and cleanly broke off all contact with the woman. I'm glad that I "slammed" him with mortal sin.
Let me ask you: Do you think it's good to withold the truth of the gravity of their situations?