This is a follow-up to question 348. Matthew Silverstein argues that "There is at least one good consequentialist reason for punishing attempted murder less severely than murder. If the two crimes are punished equally, then the law will not deter someone who has tried and failed to murder from trying again!"
I guess this is plainly wrong. If someone tries twice she should be punished for two crimes, and the global penalty will be higher (perhaps two times higher). I can't see the difference between that case and the cases where someone commits two (accomplished) crimes of the same type against the same person (or, for that matter, against two different persons).