Comment spammers.
You forget that they fall somewhere between “serial killers” and “those annoying earnest little twerps trying to stop pedestrians so they can raise money for what I’d consider mostly good causes if they weren’t hiring these twerps” on the scale of people who the world would be better off without.
Update: Look what arrived on this very post two hours later: “I frankly knew about many of this, but in spite of this, I still considered it had been helpful. Very good job!” From an IP in Germany! With a link to some stupid site that I’m not going to!