But they are all a law experts, not all kinds of experts. Economists are famously partisan. Sociologists too.

Law is fairly obviously a different field, because they are focusing on the details of legislation and that is a moderating effect. Let me give you an example. If you spend an inordinate amount of time geeking into the technical details of (association) football, you probably cannot really be a harcore hooligan / ultra type supporter. What the ultras worship is an ideal of the game, an ideal of a team. While you care about the minute details.

Economists, sociologists, unlike law experts, do not focus on the minutiae of legislation but rather they subscribe to sweeping schools of thought that promise to offer answers to a wide variety of deep social problems. They have a bit too much of a zoomed-out view. They are more saviours than tweakers.