Consider, Dahir Adan, the attacker, apparently asked at least one of his victims whether or not he was Muslim before stabbing him. A Muslim terrorist targeting Midwestern-nice white Christians? It's supposed to be Core America oppressing Fringe America, not the other way around.
The attacker struck from a distance so close to his first victims that the only possible defense said victims would have been able to utilize was to profile him ahead of time. A young black guy of east African descent, probably Muslim? If you're aware of your surroundings, he should be on your radar as soon as he comes into view. The Talk could've saved some unfortunate mall-goers some pain and suffering.
He wielded a knife. While not necessarily as deadly as a gun--none of the victims died, after all--it's psychologically even more horrifying for the victims experiencing it than a firearm is. There's a reason why slasher horror movies involve antagonists armed with hand-wielded sharp objects instead of projectiles.
The attack was stopped by an off duty cop who shot the Muzzie dead. This incident will go down as a single fatality from a firearm.
Taken in isolation, of course, that stat gets the story exactly backwards. The application of the second amendment kept this incident from being as deadly as it otherwise would have been. These scenarios don't show up in the statistics (or if they do, they make the US look more violent rather than less so, ceteris paribus), allowing misleading and unfavorable comparisons to be made between the US and [insert Northwestern European country] when it comes to violence, particularly gun violence.
But the reason the US is so homicidal in the aggregate is because the US has so many people of African--and, Amerindian, and increasingly MENA--descent inside its borders. White Americans are as well behaved as other Northwestern Europeans are.