I think it matters a LOT. One of the purposes of Sciforums (in my opinion) is education. A lot of people come to this forum with some odd (i.e. incorrect) views of how science works, and post those ideas. Many of them learn a lot from getting feedback on their ideas. I've learned a lot here in that way from mistakes I've made. That, to me, is very different when someone comes in and says "relativity is false!" to intentionally stir up a fight. As an educator I want to help the first guy and shut down the second. Because a misinformed person (even one you consider "spectacularly stupid") may well learn and become a more valuable poster. Such events make the forum a success. A troll does not learn, other than perhaps learn how to better infuriate people. They make the forum a poorer place. So to me there is a very big difference.