You should keep in mind that we have no idea what happens behind the scenes – we may only be seeing half of shmendrick’s posts (the others being deleted). The mods have said in the past that that was the case with some trolls that people complained about. I think sometimes we expect certain things from the mods, without taking into account the effort they are already putting in.
That being said, I do like the idea of there being a user-based method of flagging trolls. However, it should not be done on the public forum. We all know from experience that it can quickly spiral into some very unpleasant and messy witch-hunts. I think that it would be nice if there was some sort of line of communication straight to the mods dedicated to flagging troublesome users. However, I don’t know how difficult such a thing would be to execute, so I don’t know if it’s something we can expect.