The codes have changed over throughout time
The Silverbloods are celebrated monster hunters renowned for their deadly skills and respected for their wise ways.
Silverbloods are trained by fellow guild members and apprentice for years before they hunt on their own. Their members are rumored to ingest silver; which helps them resist curses, magical diseases, and may even injure monsters sensitive to silver if they are exposed to a Silverbloods' blood.
Silverbloods have a strict code about staying out of political affairs. Their guild needs to operate across boarders and cultures, they can't afford to make enemies. Their strict adherence to this code keeps the respect of nobles and governments.