Personally? No, I don't think they should.
Of course by "careless" I mean have made a human error rather than "being a prick" and driving to quick etc.
If someone drink drives and kills, that, in my mind, has to be punished more than someone who thought it was safe to overtake and misjudged a...
I literally have no idea what point you're trying to make.
I imagine more people die by knife murders than gun murders in this country. So guns are actually not too bad....