The logic is simple, no matter the subject matter, or person posting. At some point someone in internet land is going to read this discussion for research, educational purposes, or whatever, and not care who the OP is/was, or if they are a troll, or are sincere in their quest. I suspect that most people land on MFK for the info supplied. Not saying that derails shouldn’t be allowed, or that they even distract the average reader. My point is that ignoring comments, even those made by mental midgets, is typically not in the best interest of the forum.