If merit exist to fight against spammer, why not the distribution came from reports? a good report will add 5 smerit, a bad report will reduce 5 smerit, and an unhandled report will affect nothing.
Because such a feature will immediately be gamed by account farms that will write posts specifically knowing they will be reported and deleted by their other accounts in the farm. For example, Farm Account #1 writes a 4-word shitpost and Farm Accounts #2-#10 all report the post. We already have accounts that open threads ratting out their other accounts in a lame attempt to get merits.