Yes, but in another context. Most worlds are constructed to be Black-and-White morality, especially in the ages-old games that things like OOTS and Munchkin parodies. And in such a context, if those are the rules and you have to play by them. In such a game, the monsters are designated as "non-human" or "outside the moral circle". It's sheer escapism.

Murphy's Law is clearly written as a world with a Gray-and-Gray morality. For those who like to explore the finer points of morality, of the problems of deciding whether staying true to ones' morals regardless of the circumstances or changing them when they clearly don't work... for those who like to question the meaning of Good and Evil, those games and worlds preferable.

Both are valid choices for a game. I like them both, at different times. It's important to keep them separate.