The problem with that logic is that it's the stupid people killing the smart ones...eg. you're drunk and have no seatbelt...you swerve off the road and run over two children playing in their yard...you then hit a tree and get catapulted through your windshield and through a pane glass window killing grandma knitting booties for her grandchildren...
The smart people should know to stay off the roads on Friday and Saturday nights. *smirk* Yeah, the point about the kids is valid, but keep in mind that grandma's already reproduced, so her demise has no impact on the future population.

So the lesson here is not to let your kids play outside, apparently.