Why do so many republicans seem to be emotionless and show lack of empathy?

I’ve seen this a lot while interacting with republicans online and it’s no secret that one of the main talking points of republican speakers is that democrats and liberals use too much emotion. I read that the makeup of our brain can determine are political leanings I don’t know if this is true but if it is does that mean that republicans and people on the right were already predisposed to be emotionless and show lack of empathy
Why do so many republicans seem to be emotionless and show lack of empathy?
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