I've seen many people pointing out the massacre in Norway, and that just doesn't compute for the Leftists - or it does, and they think they can close their eyes real tight and plug their ears and the truth will just go away.
You can ban all guns from all law abiding citizens, and killers bent on destruction will still kill and destroy. The only variable is whether there may or may not be someone on the scene of the crime with the tools, the courage, and the skill to intervene on behalf of the innocent.
That reality makes liberals wet their panties, and exposes totalitarian politicians for exactly who and what they are.