I’ll also add that American conservatives are becoming more and more fanatical, and fanatics aren’t known for their sense of humor (outside of finding sadism funny). I wouldn’t be surprised if there’s a strong cause and effect connection between being humorless and being conservative; whatever mental problem makes someone humorless is I think likely to also make them engage in the kind of poor judgment and lack of compassion that leads to conservatism and other extremist positions. No one knows exactly what humor is for, but a lack of it seems mentally and morally unhealthy.