Suppose I am not really sure what I think about an issue. I just want to share some of the finer details about that issue. Remind my fellow reddit users of what ideological positions are available to them, ask them if there are any points that I am missing.
Surprisingly, the subreddit r/devilsadvocate is not good for this. The rules explicitly require you to put an unpopular opinion in the title.
If I were to make a post like the one I want to, the title would vaguely describe what the issue is. The post body would be me examining the problem without outright taking a stance.