Because gun control will do very little.Why can't we talk about both? Saying we can only talk about one or the other is like telling a coach he can only teach offense or defense to his team.
As long as we give these people attention it will continue to happen by whatever means necessary.
Making a policy decision like banning assault weapons when the major instrument of violence in the US is HANDGUNS is even stupider. Reacting to an incident that has a very specific pattern by working to eliminate something that has a much much larger knock on effect is short sighted and stupid.
We need to eliminate what CAUSES spree killings. The attention the murdered gets. A gun was a tool in the spree killing it was not the cause. Our society of rubbernecking a disaster has more to blame for this tragedy than our lax gun laws.