There might be considerable scepticism about how often such calculations are possible. Where such calculations are possible, they will often be quite impressionistic and imprecise. Nevertheless, we can reasonably hope to make at least some informed judgements about the likely consequences of alternative possible rules. And we could be guided by such judgements. In contrast, which rules would actually have the very best consequences will normally be inaccessible. Hence, the expectablist rule-consequentialist criterion of blameworthiness is appealing.