We used to live not too far from Newtown. It’s a nice, upscale town. Not as fancy as Greenwich or the towns closer to NYC, but no slums or anything.
I would guess that this was either a nutcase, or someone who had it in for the principal over a disciplinary dispute or something similar. (Still a nutcase, if so.)
Danbury, where some of the victims were evidently taken to the hospital, is not too far away, and has a few slummy sections. But I can’t imagine why the slum folks would go all the way to Newtown to do something like this.
Looks like there were two shooters. One dead, one “at large”. Looks like more of a plan.