Why? Because the NRA represents the strongest single proponent of gun rights in America. And if the left can use Sandy Hook to bash the NRA, to make it unpalatable to the American public, they will. That's why the execrable Lawrence O'Donnell of MSNBC spouted that the NRA had "blood on its hands" despite any evidence to support that proposition. That's why Piers Morgan of CNN labeled NRA head Wayne LaPierre "dim-witted" and "dangerous" for suggesting that schools ought to have armed police, but said nothing when Los Angeles Police Department Chief Charlie Beck said the same thing. David Gregory of NBC was only too happy to bash LaPierre over that proposed policy, but send his kids to a school with 11 armed security guards.
So what does that have to do with Chicago versus Sandy Hook? The media knows that in all shooting scenarios, the conversation quickly polarizes into two positions: ban guns or discuss other myriad social and legal issues that lead to shootings. In communities plagued by high levels of social ills like Chicago, the second position is the more obvious one. In cases of placid communities getting shot up by a nutcase, the left can talk gun bans more easily.
And they can label the NRA the culprit more easily, too. When gang members shoot each other in Chicago, it's obvious to everyone that there are no NRA members involved. When people in Connecticut own guns, the media has made the case that they must be NRA members, even if they aren't. And so the NRA, with no relation to Sandy Hook, becomes the problem.
It's far harder to stop Sandy Hook than it is to stop violence in Chicago. But the left doesn't like the possible solutions in Chicago. They prefer to destroy their competition. So the shootings in Chicago will continue. So, in all likelihood, will incidents like Sandy Hook, thanks in large part to the left's focus on destroying its enemies rather than preventing acts of evil.