Republicans are more authoritarian on average, and authoritarians tend to value in-group cohesion more than anything else. They are, by some reasonable metrics, bad people.
If I remember correctly, there was a study where they did like a model UN, and they secretly put all the people who scored high on authoritarian personality tests in group A, and everyone else in group B. Group B did fine- no wars, dealt with climate change and what not. Group A, with the authoritarians, caused a nuclear apocalypse. And after they got a do-over (after they had to sit in silence for a few minutes to think about what they'd done), they still fucked it up. edit: I found it: https://theauthoritarians.org/wp-content/uploads/2024/08/TheAuthoritarians.pdf , page 30
We're all at least a little susceptible to authoritarian, in-group-above-all thinking. But some people have it bad, and those people suck. They're really ruining it for the rest of us.