Ultimately what we think doesn't matter.
But I can say this: Over the past weekend we were at Virginia Tech, where a student in 2007 walked into a classroom and shot students and professors (after shooting two students in a dorm). He killed 31 people, including himself. The building where he shot 28 of them was immediately closed, as you would expect. It did reopen after extensive renovation and the classroom areas are no longer classrooms -- Va. Tech now uses that building for offices and laboratories. So no one ever again will attend a class in that building (Norris Hall) or have to sit at a desk and wonder, "Is this what it felt like to be sitting a desk in a classroom here that day?"
The building was not razed because as someone said, destroying the builidng would not erase what happened that day. And the buildiing contained specialized laboratories that are replicated nowhere else on the campus. Some students were unable to work on research for months while the building was closed, delaying their degrees and their theses.
The point is that Va. Tech. managed to be both sensitive to the families of the dead and sensitive to the feelings of the living while also recognizing that the buildiing was not somehow at fault. Yes, it becomes a reminder but it also becomes a memorial.
At Newtown, they possibly could convert the classroom space where the shootings took place to other uses so it would never be a classroom area again. That might also require the school to build new classroom space at another place in the building. It's one way to say "We didn't let the bad guy win" because, to me, knocking down the whole building is doing just that -- letting the killer win. But the reality is also that knocking down the entire building and rebuilding there or elsewhere could create a huge strain on the school system's finances that will affect the Newtown kids and others in their system for years to come. That too would be lettiing the bad guy win. If they can keep the school as a symbol of carrying on, and not use the exact areas of the killings as classrooms any more, that would be a good option, I think -- but that's only what I think, and I'm not one of the parents.
My daughter had events to attend at a building right next to Norris Hall and yes, it did go through my mind that "that's where it happened." But seeing the vitality of the Va. Tech students, and the beautiful memorial directly in front of Norris, was really touching.