The best parts of this film that nobody mentions

That moment he manages to feed the sparrow for the first time and it takes the food so eagerly.

His gradual evolution from a poor kid with an alcoholic father who died when he was 13, which led to his anger management issue, to a person who ever so slowly develops feelings for others and the capacity to show and share them. Even to a sworn enemy like Harvey. All because of a chance "fall of a sparrow". It's a message of hope for everyone that for anyone troubled if they can just take a sincere interest in a constructive project they can do good in the world and for themselves.