A note should also be highlighted : No pm/topic are allowed to be sent to mods/created to discuss this deletion.
By necessity, that would require the shitposters to actually read the rule--and you know damn well that ain't gonna happen, and there wouldn't be a way to block a PM to a mod, because you couldn't know beforehand what the PM is about. It isn't a bad idea by any means, but logistically it's a nonstarter.
Personally I'm very OK with threads--and my posts--being deleted, because I realize it's just moderators doing their job. I think if you're so concerned about deleted posts, you're a bitcointalk member for the wrong reasons (not talking about you or botany here, I'm speaking of the signature/bounty shitposting plague-carriers).
If mods are doing a good thing by trashing spam threads, why add more work for them by subjecting them to the whiny noise from language-skill deficient morons who will never be satisfied with the answer, won't understand it, and will continue to bitch about the deletions incessantly? This is something we're all just going to have to deal with, notification or not.