I take the Groucho Marx approach to my Catholic faith:
“I DON’T WANT TO BELONG TO ANY Church THAT WILL ACCEPT PEOPLE LIKE ME AS A MEMBER.”
Which is to say, I don’t want to belong to a Church of sinners, but I am over-joyed to belong to a Church that is made up of sinners who are working to be saints.
If a couple is unwilling to comprehend the sacramental nature of marriage and to prepare themselves in such a way as to receive that sanctifying grace, then no, they should not be married.
I have known couples that had to separate for a time before they could be married. I am not entirely in agreement with that, but what is the alternative? They never marry and continue to live in sin? Like I said, short on details the media. Were these people recent converts? Had they stayed away etc. It’s important to know the particulars. That why marriage tribunals are important. Every case is different.