I think the point is that innocent people die every day. By the time I’ve typed this out, some more have died. It may seem crass and heartless, but the number of innocent lives in the relatively small population of death row is many orders of magnitude lower than in many other populations such as victims of avoidable vehicular accidents. Yes, both issues can be attacked at the same time. But the purist anti capital punishment view is based on an emotional argument, “even a single innocent life taken by failed justice system is too many”, while fatal accidents are essentially wholesale slaughter, relatively speaking by the numbers.