I'm not sure I understand what you're talking about. You're related to a couple who have a son who went no contact, but it had nothing to do with politics or abuse? I'm not sure how that maps onto this situation.

I know some people who have gone no contact due to manipulative dynamics, though the parents refuse to acknowledge they've ever done anything wrong. E.g. financial manipulation, or refusing to use their child's preferred pronouns. I feel like if the parents apologized, acknowledged the problem, and made a commitment to change it would make everyone happier. Not sure how that applies to your story, but that's been my experience.