A Thought Experiment
Meet the Bernards:
Bernard A wanted to murder his Aunt Agatha in order to inherit her fortune. Sadly – for him – the opportunity never arose in which he was able to do so safely, and therefore he had to wait until she died of natural causes.
Bernard B exists in a parallel reality which is identical to Bernard A's in almost every respect, except that an opportunity arose in which he was able to murder Aunt Agatha and inherit her fortune.
The Day of Judgement comes... should Bernard A be judged more harshly than Bernard B?