Why do political differences break up friendships and families?
Because political positions have increasingly become markers of identity and moral character rather than policy preferences — so disagreement reads as a statement about who you are, not about what you think.
What changed. Research across several countries documents rising affective polarisation: hostility towards the other side has grown much faster than actual disagreement about policy. People increasingly report discomfort at a relative marrying across political lines, and sort themselves geographically, socially and in media consumption, so cross-cutting contact — which historically moderated views — declines.
Why it feels different from other disagreements:
Moralisation. When an issue is framed as a matter of right and wrong rather than trade-offs, compromise itself becomes suspect. You can disagree about tax rates; you cannot easily agree to differ about whether someone's rights are legitimate — and many contemporary disputes genuinely are of the second kind, which is why "just don't discuss politics" is not always reasonable advice.
Identity threat. Criticism of a position held as part of identity is processed much like personal criticism.
Inferred character. People assume a position implies a broader set of beliefs the other person may not hold at all.
Asymmetric stakes, where an issue is abstract for one person and directly consequential for the other. Ignoring this is what makes "we can still be friends" land badly.
Media and algorithms, which reward outrage and present the other side through its worst representatives.
What actually helps, where the relationship is worth preserving:
Distinguish positions from people, in both directions.
Ask what experience led them there, which produces more movement than argument does and is the one reliably de-escalating question.
Accept that you will not convert anyone in a conversation. Views change slowly and through trusted relationships, which is an argument for maintaining them.
Agree scope — some topics off limits, at some times.
Know when not to. Where the disagreement is about someone's safety, dignity or existence, distance is a legitimate choice and not a failure of tolerance.