Your own link reports that Republicans were the largest group (23%) who were definitely not going to get vaccinated. And that more white people than black people say they definitely won't get the vaccine, as well as higher percentages of white people than black people.
So what we know:
1. Republicans, and groups closely associated with voting Republican (like white evangelicals) are the most likely to not get vaccinated.
2. Republicans, and groups closely associated with voting Republican, are the least likely to take public health measures like wearing a mask and social distancing seriously (multiple public opinion polls have shown this).
3. Information outlets such as Fox News, very popular with Republicans, repeatedly spew anti-vaccine, anti-mask, and generally anti-public health misinformation.
The statistics I cited are predictable and consistent with the above. You're right, the correlations by themselves would merely be suspicious. But we have an extremely visible mechanism in place and we have a pretty good measurement of public sentiment on these topics. It all fits.
A further and deeper question: is it reasonable, in the face of a torrent of misinformation, to expect people to make good decisions about their health all on their own?
Another deeper question: which is worse, denying care to people because hospital capacity is exhausted or force people to be vaccinated? You have to pick one.
David Bonn 
