Dolan Am

Ill b honest, i dont know why Butler chose to kill all those innocent people for no reason? and why he had to be inside the jail to do all these? Like is he wants to change the system he could easily be doing it from the outside while he was getting a pass to go out? why he chose to be inside?? Like Aaaaaa....if I was the writter I would make the movie a bit better to get ta rating at least 7 to 8, I usually dont write stuff that gets 4.4 rating, that way below my standard.