The law isn't an intelligent being that makes its own choices. It is an artifact created by humans, who have a reason for making it such. Humans have considered, in the US, that hiring a hitman to kill a target is murder, so they have ensured the law reflects such. Since an entire rewrite of the law isn't possible for every change, it sometimes means that the law will have to have less than perfect patches applied. But to suggest that the way it is reasoned about in law is the way it is meant to be makes as much sense as looking as a kludge and saying that the kludge is what was wanted, ignoring all the factors that lead to the genesis of a kludge.