Am I wrong for telling my son he can't bring his fiancè to holidays this year

My son has been with his fiancè for 5 years and it's been nothing but drama. They are not good together and I hope they just final separate for good. They have broken up like 10x. They are toxic. Anytime they are here they argue and scream at each other and it's ruined several holidays. We had to call the police on New Years because they got so out of hand. My son isn't perfect. I'm not goitto pretend hes never done anything wrong in the relationship. I don't even hate his fiancè. The problem is the are both two very troubled people, who have trauma that they have not worked through and have awful communication issues and bring out the worst in each other. There are kids at these Holidays. I don't need them scared because my son and his fiancè yelling how much they hate each other and saying things like "Take your small dick somewhere else you fucking retard." And he's saying "No other woman has had an issue. I'm a full 8 inches. Maybe your slutty ass pussy is just lose." Then she hits him and everything is bad. They're both not great together. I honestly think they just bond over their trauma because I do know she was a sex trafficking victim and my son had been SA'd in boy scouts for years. That seems to be what hold their relationship together. I told my son I love him and he's always welcomed here but the both of them together is a no go. It's too much drama and it just traumatizes the kids here. Now they're both mad at me. I've told them both they do not belong together. They aren't good together. You shouldn't be with someone just because you can relate to their trauma. But they're both adults. I can't stop them from being together but I'm not subjecting other family to their toxicity.