Just an FYI, this person is not referencing the USA's approach to gun laws. My gut reaction to the title, unfortunately, was, "so this author wants us to start driving cars into schools, now?"
But even so, this idea is strange and wasn't fully fleshed out. Just because you take large SUVs mostly off the street doesn't make cars any less dangerous to pedestrians, and removing criminal offenders from the drivers seat does absolutely nothing to counter drunks, and certainly nothing about oblivious drivers or older folks that rightfully should never touch a steering wheel again.
Also, a smart car can still kill a person, especially at 55mph as they used in their example. Like, ok, maybe one turns a human into a pink mist while the other just breaks their neck and slides them across the pavement. As long as the gore is less, then the fact that both humans died doesn't matter I guess.