Not sure what folks are talking about here. I haven't really seen much of Melo "intentionally hurting" someone; that would be difficult to prove anyway. Much of what I've seen are just really clumsy tackles, professional fouls and boneheaded errors. While that has certainly cost us, his exuberant and somewhat scary passion has not, as much of it is in the form of facial expressions and fist pumping like we have seen. Nothing wrong with that. Refs can't card a guy for looking mentally challenged because if so, Rooney would be sent off at kickoff.
Again, criticize players for what actually matters and his true weaknesses in form and ability. Melo's errors are not temper related, but rather related to temperament.