What harm did it do anyone, especially after its low score got it off the main page? Do the mods realise that they're also deleting contributions from numerous other people who may, in fact, be interested in continuing the discussion with the hope that perhaps that fellow might see sense after all?
I feel we ought to explicitly refrain from closing questions on the basis of their quality, provided they're on topic and not offensive, which despite one person's rather random claims to the contrary that question was not. With a voting mechanism in place (and affecting a post's visibility), this is the kind of moderatorial voluntarism that I've seen ruin online communities before.