Anti-gun folks argue that since so many people die as a result of handguns, they should be banned. But despite the fact that in car/bicycle crashes the cyclist inevitably gets the worst of it, no one is seriously calling for the elimination of automobiles.
I think it is because they see cars as much more necessary than guns. IMO The reality is that both could benefit from more regulations and harsher penalties and enforcement.
Paris' "School Streets" are an effective and widely written about implementation, but most modern cities have some concept of car-free street and a few examples, even if it's not widespread.