* I want to be able to be an informed participant in my healthcare. When the US Gov lied about mask efficacy so that there would be enough masks for healthcare professionals and when many Americans considered this acceptable, I lost faith in the government's ability to meet this need of mine. Either they were incompetent or malicious and neither trait is one I desire in someone treating me.
* My life involves a wide variety of risk taking: I use drugs, motorcycle, bicycle, jump off bridges, etc. During the COVID crisis, many Americans stated a desire to allocate healthcare according to behaviour. I would prefer to pay to offset my risk rather than alter my behaviour. I fear the puritan streak in American politics will push me to the back of the line in healthcare despite my ability to offset any risk with money.
* I am a software engineer. I am high income, relatively wealthy, and overall fairly comfortable. I am also in a profession that does not provide me a social cachet. During the COVID crisis, many Americans stated a desire to allocate healthcare according to a notion of value to society that elevates those with high social cachet. These are generally people who can be argued for: teachers ("they are taking care of our next generation"), medical professionals ("you don't think we should treat our healthcare heroes first?"), soldiers, firefighters, police, god knows what. I fear that people's dislike of my profession will push me to the back of the line.
So now, no universal healthcare, thank you. And yes, I am quite familiar with the NHS. I've paid enough into it and have many family members who work for it. The existence of other successful systems does not mean that the US can replicate them. There is a path problem, a second system effect, and differing social norms.
Well, there you have it, an actual statement of reasons from someone who actually opposes UHC.