This is a case of self-defense, pure and simple. The defendant McInerney was obviously scared out of his mind by the potential rape by King. He felt his life and sexuality was in danger. So, he took a pre-emptive strike to the rape before it even happened.
The irony is that if this were the other way around, that some male high schooler was ogling a female student, and the girl killed the guy, the liberals would be out on the streets defending the female student saying she was acting out of her own self-defense and safety against a perverted rapist.
Double standards.