Tribalism, and because human brains are stupid.
I applaud Stros for his answers, and for being willing to engage, even after he's taken a fair bit of shit. His answers seem a lot like my parents' answers, and his lack of response to some of the pointed questions is also similar. I think he's answering in good faith, but I suspect that those answers are mostly there to paper over the cognitive dissonance of potentially voting for someone who, deep down, he thinks would make a shitty president. That shitty potential president has an R next to his name, though, and Stros probably has a long history of being a part of Team R, along with peers/friends/family. A vote for Harris would be voting against his tribe, and brains are excellent at finding reasons to do things to avoid painful dissonance.
Stros, I assume that you think of yourself as a rational person who looks for truth, even if it might feel uncomfortable. I invite you to ask yourself a few questions:
It seems like you consider yourself a high-information voter. Do you consume "left leaning" viewpoints as often as "normal" or "right leaning" ones? How do you know which are which?
Do you know what Team R propaganda/misinformation looks like? What's an example? How do you avoid falling victim to it?
What piece of information would cause you to change your mind about your vote? You mentioned the economy and being willing to vote for Harris in '28 if things looked good in that regard, but people are notorious for delaying painful decisions while they "wait for new information." Both candidates have a history - which better supports a view that they would create a stronger economy? Would you be willing to go explore multiple, independent opinions on that?
I'm not expecting answers to these in public, but if you're really interested in looking for truth, these questions are worth thinking about for more than the time it takes to dismiss them. And, to be clear, there are some left leaning posters here who should definitely also be asking themselves these questions, just pointed the other way, especially that one about propaganda and misinformation.
Again, Stros, thanks for participating.