Well...in Callie's defense, it may not have been caring for whether or not O.J. did it, but for why someone would post a thread about a very tired old topic that not many would care about (the topic...not the thread). So it's possible that she cares about the thread and so responded to it without caring about the topic at hand.
At least, that's why I responded to it.
That and because I'm already here and not responding to it would be a waste of my looking at the thread in the first place.