This is often the implied context around this polling: do you want better services and lower taxes? Yes. Yes, of course.
The issue for america, in the case of universal healthcare, is that it would dramatically increase the tax burden and worsen healthcare for the middle/upper-middle. How many are so noble when it comes to this double-whammy? Few.
On paper, people will spend other people's money with glee. In practice, politics expresses something ideologues can never really tolerate: that society is often getting what it wants.
Or, more precisely, that the social ecology is both healthy and imperfect. That society may not get what it wants in some sense, but not for any malignant reason.
The ideologue always has to locate the failure to reach the ideal with some flaw in people, in the system. They cannot brook that through ordinary, indeed healthy, political process can come non-ideal outocmes.