"Today in the news, a disgruntled student crashed his car into a school today in an attempt to kill 17 people. Police say his plan failed when his car made contact with the wall instead of with his intended targets. Now on to Sharon with the weather."

Sharon: "Thanks Andy! Yes, today we see a forecast of rain between noon-4pm made of largely by this system you can see here on my map. Now, what you'll notice from our doppler radar system is that this weather system here is actually made up largely of the tears of gun enthusiasts crying over the fact that their argument repeatedly makes no sense. There's also a low of 16 this evening. Back to you Andy."

I do agree cars and knives are able to kill large swaths of people, but these 17 people wouldn't be dead if he was trying to run them down with a car or stab them all individually with a knife.