I think the reality is a lot of people aren't that smart. And sometimes even smart people can make bad choices. The average IQ is 100.
Here's an interesting random paper for you: https://www.sciencedirect.com/science/article/abs/pii/S01602...
"• Individuals who identify as Republican have greater probability knowledge
• Individuals who identify as Republican have higher verbal reasoning ability
• Individuals who identify as Republican have better question comprehension
• Cognitive ability’s effect on party identity works through socio-economic position"
At least this does not seem to support the common opinion here of presumably a democrat leaning crowd (based on the comments) who seem to think that their opponents are all morons.
Bottom line of sorts for me is that we need to be able to debate issues from first principles and based on facts. We often go to appeal to emotion and herd mentality instead. Very much so on these sorts of partisan button pushing threads.