Although it is true that the experiences the Lilos have are important to their actions and reactions, the fact still remains that the original Lilo could have easily been put in the same situations that led to the duplicate killing Mari. If the original Lilo did go through what the duplicate did, it would only make sense that she would act and react the same way the duplicate did, considering they are the same person.
Some may also argue that these experiences have the power to alter someone’s moral judgement, and therefore the duplicate had a different set of values than the original Lilo when she killed Mari. Even if this were the case, it does not take away from the fact that Lilo could have easily gone down the same path and had the same change in values. Even if the original Lilo considers this possibility after learning of her duplicate’s act, I do not think it would be comforting enough to absolve her