I'm not a lawyer, but I have a basic understanding as we cover some of the aspects of law in our martial arts classes. One of the biggest reasons he got what he did was because the stun gun was disguised as an everyday object. This in itself is highly illegal - sword canes and the like are illegal for this very reason. The only way you have a defence is if the item in question is antique. As we use swords (wooden/bamboo) this topic does crop up occasionally. And regarding the defending your home - the basic premise of the law (and what we are taught) is to retreat & run if at all possible under every circumstance, and to only ever use our art as a last resort. It shows you are doing your part to try to not fight, and the law likes people not fighting. However when it comes to your home, it is considered that you have already retreated - it is meant to be your safe place. It does not given you permission to use excessive force, but only what is deemed necessary by the court.