[klipt]

Causal or just correlation?

It's easy to imagine spurious correlation. Eg Italian Catholic populations may be more right wing than British Protestant populations.

But that doesn't mean it's Italian genes making then right wing.

[Real_S]

These twin studies control for ethnicity and cultural heritage.

Side note, I personally know one of the researchers on this paper and can vouch for his talent and credibility.

[mateo1]

You imply that they care about this. They don't.