Sure, some debate is missing here. But I think it's fair to posit that the debate in question is of low value, and that we're better off without it. Or, at worst, that losing it is a wash in the grand scheme of things.

In either case, the owners/operators of HN set a standard for the kind of discourse they want to encourage, and they take steps to encourage it. Nothing wrong with that. Reddit, Slashdot, 4chan, Twitter, and countless other sites exist for people with different tastes.