[Bayart]

> For example, in America you say "I'm a Republican." but in Germany you say "I support the CDU." Notice the difference? One is an identity, the other is an action. Guess in which of these countries you can have polite (even if heated) dinner conversations about politics!

I doubt that element of linguistics has any real importance. In Romance languages you'd say « I'm a left/right winger », « I'm a socialist » etc. and the social culture is very much less radicalized than in the US in that respect. Politics was a normal subject of conversation at the family table when I was a kid, and it's a normal one at the bar as an adult. If anything the inability to be able to talk about politics is taken as a sign of immaturity or poor education.

This being said, I do think your original point about identity stands and touches upon the core of the issue.