But not so drastic that he start killing pple And using guns/bullets.
Even the dark knight return comic, where the movie draw inspiration from. Bat man is brutal, break hand or leg, to show dominance and seed fear on his opponent. When he got upper hand in a duel with the boss of the gang, he purposely throw away his weapon and get down & dirty as a show of force. Which later that gang become sons of batman.
Even the part of where Jason todd is killed by joker been retcon to batman did not kill joker even though with his rage, thus the moral high ground & in the process passed off joker greatly because he unable to break batman.