Rather no pointless content allowed. I'd say that the level of fun shouldn't decide wether it should be on hacker news at all. Unless it's the "meaningful" kind of fun.
If it's the meaningless kind of fun together with meaningful content, then it should be judged by the meaningfulness.
These are the rules that I just made up. Let it be so.
A world where the point is to have war, I mean, fun.