User blog comment:PirateKnight19/Luffy's Father sailed with Gol D. Roger/@comment-108.35.62.245-20170529195229

I've always thought Dragon was independant from pirates but respects what they do to a certain degree. Pirates deify the law, which Dragon sees corruption in, so while pirates are not enemies they are someone he doesn't have to oppose. I also doubt he knows the truth of the Void Century, but has seen and experianced the centuries of corruption within the world government and felt compelled to oppose it. He helped Luffy perhaps due to family bonds that he may not be ready to face, after all he still is Luffy's father no matter how distant he chooses to be. Dragon probably respected Roger since Roger was a free man and deified anyone who tried to hold him back/down but I have serious doubts Dragon was a Roger Pirate