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Honestly, it depends on a community by community basis how to handle these things.
Mods are people too so there's no harm in playing along for a while (and only for a while for the sake of maintaining order in the forum). At the end of the day the thread will have to be locked / deleted because it isn't actually conducive to conversation (at least in where it's posted -- suicide discussion).
What you could do (if permitted by head mod / admin if such a chain of command exists in SaSu) is just state intention of when thread will go down, maybe give another 30-60 minutes. Let people blow off steam, then delete thread later. That way you do your job, but also let people get it out of their system.
Else, just pull the trigger. No one is going to actually be upset. We know we're being silly and completely out-of-pocket.