There are comments at the bottom of the page that are opposed to single payer, and the 3rd most upvoted comment is in favor. If you look at the comments from top to bottom, you see that the less upvoted comments are generally less specific, and tend to be more one-word answers, and the more popular answers tend to give more detail and/or explain their reasoning. Also, the most upvoted comments tend to be posted earlier. The newer comments (more of which are pro single payer) tend to be less upvoted, since less people have seen them. Both of these patterns seem to hold true regardless of whether the comment is pro or anti single payer. And even the most downvoted comment isn't super downvoted; it's only at -2.

Also, being opposed to single payer does not necessarily make one conservative. There are plenty of liberals who want to see healthcare made more accessible and affordable, but aren't convinced single payer is the best way to go about doing that. This a viewpoint held by many experts in the field, such as healthcare economists.

In the past I've seen complaints that this sub is both too liberal, and too conservative. To me that's a good sign that it does a fairly good job representing a variety of viewpoints, at least compared to many other subs. Though I do agree it tends to be polarized depending on specific issues. For example, it is very pro-gun, more so than the country overall I'd say. It isn't very religious, and is pretty liberal on social issues. It feel like it tends libertarian on issues such as government surveillance. On other issues it seems to be split. Not so easy IMO to categorize as "conservative" or "liberal."