The monarchy's fallen, so belonging to covenants is the safest way to live where I'm from. I joined the Warriors of Sunlight because my skills aligned best with them - hitting things in the name of jolly cooperation and helping the common traveler. The Warriors fight alongside other covenants who share similar goals, and refuse cooperation with covenants that propagate evil. We've good assassin covenants and malicious ones.
But you were right earlier, when you said I was not subtle - I'd make a terrible assassin no matter what.