Your counterexample relies on a lot of claims... A) Sweden is considered a model for the rest of the world to follow. B) Sweden has a homogeneous population. C) That homogeneous population is the primary reason for Sweden's success. D) Nationalized healthcare in the US is a pipedream. E) It's a pipedream specifically because of a "diversity of viewpoints".

There have been books written on why nationalized heathcare is hard to achieve in the US. It's a very complex issue that is inherently entangled with both the mechanics of the US political system and the US media. Blaming it on a "diversity of viewpoints" does a disservice to the issue.