Also, Arthur has been with Dutch for over 20 years, and is the second-in-command. Whether or not he agrees with the orders Dutch gives him, he still takes responsibility to protect and provide for over a dozen women and children, be it for the good of the gang.
I just finished the game last night, and I found the story to be among the best in any game I've played. If it weren't for how good the story is, I don't think I would have enjoyed this game nearly as much as I did. It felt sluggish at times, and with the enormous number of slow animations and in-game cutscenes where your character is forced to walk a slow, set path, it was difficult at times for me to continue playing. The last 25 or so quests I just rushed through as I was only in it for the story at that point, and I didn't want to leave the game unfinished.
Looking back, damn, that was an epic journey...