Where do you think the "spirit of the law" comes from and how does a judge apply it? It's by thinking about what others would expect. Whether it's about the past (original intent) or the future, this is an act of imagination (supported by research) where they are thinking about what others would want. There isn't any "view from nowhere".

If you don't care about what other people want and how the law affects people, then there is no morality or justice and it might as well be a coin flip.