A few days ago I read this question about why there is no "autumntime" or "falltime". I added this comment:
We just use fall or autumn in those cases, both as nouns and adjectives. Not really sure why. We just do it that way. That's not to say you couldn't say "autumntime" if you really wanted to.
Yesterday I noticed the comment had been deleted. I'm curious why that was. The comment was not an answer, certainly, but did not pretend to be one. It was germane to the question, which was itself pretty broad ("Why is it so?" questions tend to be broad to the threshold of being unanswerable, in my view). But it certainly was not offensive. (There are certainly plenty of less germane and more questionable comments scattered throughout this site.) If there was a reason for the deletion, I want to know what the reason was, and if that is a policy.
AndrewLeach restored the comment after I mentioned it to him. But I'm still left with more concerns:
Who are the comment police, and why are they deleting comments that are not offensive but offer some value? Is one of the mods grinding for a badge? If so, that calls into question the idea of badge rewards for potentially destructive activities.
Update
After reviewing some of the answers to this question, especially those which attempt to draw distinctions between what is and is not a "useful" comment (some related at great length and with a form of special pleading one normally might associate with legal briefs from the tobacco lobby), I have to say I still am unable to fathom the difference. I just now looked at 50 or so random comments and in all but two or three the "rules" offered here as guidance were about as useful to determine suitability as a magnetic compass would be to find gold.
I see too that the only reasonable answer here (Daniel's) has been pounced on with negative humor.
Hey, do what you like, folks. Just don't call it logical, transparent, or in any way justifiable. Have the dignity or the courage or whatever it takes to own up to the fact that you don't have any ideas on the matter either besides "Because I said so" or "Hey, it seemed like a good idea at the time."
Recent Update
Well, the Splenetic Mod strikes again. What was restored has since been destroyed. Haha, what a petty little site you run here.