What if he had a form of autism that has little or no link to violent behavior? Lanza may have had Asperger’s syndrome but, even so, that is not a cause.

What if it’s too simple to lay the massacre at the feet of the gun lobby? Reader Larry Kelly tweets that shaming Aspies “makes about as much sense at stigmatizing the NRA. Pick an enemy … any enemy. Let outrage and fear rule.”

What if Lanza wasn’t provoked by video games? David Axelrod, a close friend an adviser of President Obama, tweeted last night: “In NFL post-game: an ad for shoot ’em up video game. All for curbing weapons of war. But shouldn’t we also quit marketing murder as a game.”