I don't see the issue here. The violent drug crazed criminal has a long criminal history. He was throwing rocks at civilians, cars, and the police. He injured two police officers with his rocks. The police has already tried tazering the drug hyped criminal to no effect. He turned on the officers and looked like he has a weapon. He got what was obviously coming to him.
Pretty simple = Don't throw rocks at cops = Don't get your ass shot.