IMO It also reflects the different voter bases. R’s have a higher % of ‘wield the sword of righteousness against our enemies’ voters, and D’s have a higher % of ‘can we please solve actual problems and live our lives’ voters
I think the GOP base is also more homogenous, so it's easier to pander to its worst instincts.
Dem voters aren't necessarily any better individually, but they're such a diverse coalition that pandering to the specific derangements of any one segment risks alienating the others.