If you want to understand why people's political reasoning is so bad, listen to sports reasoning. I have made no study of whether liberals, conservatives, libertarians, or socialists are more stupid. I can cite individuals examples of each.
I don't mind that people have bullheaded opinions and varying levels of expertise - I'm talking about both sports and politics here - I only mind absolute stupidity, that you can see what it is based on and pound your head. I know enough sports to recognise professionals making weak comments and believe I could do better, but I also know people who are just much more competent. My second son; B S King's husband, and her father (especially on baseball and sports history since 1960); a guy I knew from St Paul's ASP.
But the table next to me at beer night last Thursday. They don't like Joe Kelly, reliever for the Red Sox, because they don't "trust him. He'll have a good game, then a bad one." I know where they get this. Joe Kelly gave away a victory on Opening Day. They remember that to the exclusion of everything else. Yet since then he has had 19 good games and one he escaped by the skin of his teeth. ERA of 0.38. (For you non-fans, that is a very good number.)
I will not bore you with further examples, but the principle should be clear. Scott Alexander made a very good argument why Basic Income is a better idea than a Guaranteed Job (and linked to a good criticism of his own work), which I can admire, even though I like neither. It's not crazy. It has things worth attending to. Even if wrong, it might capture some important secondary points. I speculated tonight that perhaps only 10% of the population can actually do this.