I basically responded to this question on the previous meta question post, but I'll give a specific answer to your question here.
Stack Overflow found in it's early days, they allowed a number of questions of the same kind of quality. What happened is that these "fun" questions started to take over the site, and making it more difficult to get the answers that really mattered. This has been brought up in countless MSO questions, and a fair number of blog posts. The best of these that I can find is a semi-recent post, The Problem with Popularity. Specifically, I'll quote this part from near the end.
This is why community moderators have real power; they need that power
to intervene, educate, and refocus the community’s exuberance on more
substantive content. People will fight you almost literally to the
death over their right to be entertained, and to entertain others:
Why can’t you just not look at these fun posts? Why do they have to be deleted? You guys suck!
The same reason the moderators and community on that subreddit didn’t
decide to “not look” at the fun posts, really:
Broken windows. Every ‘fun’ post users see is an open invitation for them to participate in the fun by adding their own fun question or
answer. The stuff spreads like kudzu! Pretty soon the entire site is
overrun with nothing but that kind of fun. And even if you grandfather
a few in, you’ll enjoy neverending requests asking why their fun
question or answer has to be removed, while this one over here is
allowed to remain.
Opportunity cost. Every minute spent participating in an entertaining ‘fun’ post is time that someone could have spent asking
or answering a substantive question, something practical that solves
an actual problem for hundreds or thousands of people. Entertainment,
within reason, is by no means a bad thing — but I experience almost
physical pain when I think about a brilliant topic expert spending 10
minutes on one of our sites deciding which hilarious cartoon is their
favorite.
It's one of the most difficult parts of being a moderator, closing and removing questions like these which are fun, popular, but don't serve ultimately the betterment of the community.
There are countless questions which are on the line. Some of them I agree with, and others I don't agree with quite so much. But the question in note leaned on the site that was more for fun, and not for learning.
I guess that's pretty much where I draw the line with the borderline questions. If they allow everyone to learn something, then they are great. If they are just purely for the fun of it, then I'd need a lot more convincing...
Lastly, let me talk about the community consensus. I first noted the question because it was flagged. So, I took a look at it, noticed that there was a significant number of down votes, as well as 3 votes to close. I looked at other criteria, and decided it was indeed worth closing. All of that came without looking into the next bit, but I would say that there was far from a consensus to keep the question opened, but rather, the decision seemed to be split in half. Given all of the above, and the fact that the community seemed divided, I decided to close the question.