Guns or Violent Videos: Which Is The More To Blame?

Newtown, Connecticut and Aurora, Colorado massacres both featured assailants dressed in military garb using automatic weapons that were easily obtained. Easily obtained guns were obviously.a sine qua non component of the tragedies. But why were both killers in military uniforms? That didn't help them kill. Guns by themselves are blameless. Blame is on the user. It's a fact that mass murders can be carried out by other means. E.G. explosives, fires, toxic gasses, mass killings caused by sabotaged vessels etc. The military clothes suggest a role playing. Could the easily available violent video game which features uniformed combatants be the true source of violent behavior in our society? Parents routinely give children hand held devices with brutal videos as a cheap baby sitting surrogate. It turns out this alternative may not be so cheap after all..