Telling me this is because of poor impulse control implies a subconscious level of innocence. 'Oh, he didn't know what he was doing. If he just took a moment and thought about it, he would normally never do something like this. Things just got away from him.'

Bullshit. He was in full control of himself. He did this because he wanted to. His natural impulse is to do this, and the rest of him agrees.