I'd say Davy was the biggest jerk. In the first movie, Norrington was just doing his job, and also gave up Liz putting her happiness before his. And in the next one, he does betray them all, but was he ever really on their side to begin with? He lives to work. Remember how when he holds the compass in the first movie it points to Jack. He loves capturing pirates and enforcing justice. He doesn't want innocent people to be victimized by them.
But Davy will pick up anyone on the ship and enslave them or kill them. It doesn't matter if they're pirate or not. He might shed a tear or two for separating Will and Liz, but he doesn't spare Will, and the whole reason he's in the movie is to COLLECT SOMEONE'S SOUL! He was hurt, but he became a monster.