Soldato
Sure, but you get enough time to think 'if I insert this inside their flesh it's probably going to kill them'. You don't really do that unless you're a little bit evil. There's a difference between waving a knife at a 14 year old because you're intimidated and plunging it into his body.
You might be some kind of navy seal but i'm sure that most people when forced into a situation where someone is invading thier home would go into a state of immense fear. In such a state they would act and react in an impared manner, not thinking things through logically as we have the opportunity to do while sitting browsing a forum.
That being said, we dont have many facts here so it is really pointless to try and deliver judgement on what happened, who was in the wrong and to what degree.