Why kill him?
I know they said there would be trouble if he stayed but it didn't seem like that much time went by.
shareWilliams was trying too hard for a tragic ending. Like other films, I am guessing that he wanted the "rebel must be destroyed by the establishment" kind of ending.
I. Drink. Your. Milkshake! [slurp!] I DRINK IT UP! - Daniel Plainview - There Will Be Blood