I've never been able to justify to myself the existence of causing death by careless driving as it's own crime. It's outcome based offending and that seems, to me, to be completely arbitrary. You could have a degenerate who is drunk, high, speeding and doesn't give way at a roundabout but doesn't kill anyone and they get charged with drive without due care (probably aggravated because of the drunk, high, speeding part). On the other hand you have a decent person driving home who mis-judges an overtaking maneuver or doesn't see someone step out from behind a car and kills someone. They get drive without due care causing death. Not trying to defend this ham but I think the "causing death" part is irrelevant. If you speed or drive drunk or drive like an idiot and you're lucky enough to not kill someone you don't deserve a lesser jail sentence just because you were lucky that nobody died.