As for Aaron's concluding statement that good intentions are no defence, i only partly agree. I think it's reasonable for intentionality to affect the way we treat or punish people who commit crimes. Human behaviour toward other people (and the legal system, by extension) is based on a predictive model of how people will act, and knowledge of intentions affects the predictive model. Nonetheless, good intentions will never un-rob, un-rape, or un-murder anyone, and an appeal to good intentions does not allow one to escape responsibility for evaluating the consequences of actions.
I'm curious what you think about this.