Is it really? You may wish to look it up as you are seriously mistaken. Yes, you can use lethal force, but not against a kid who has slapped you and is in the process of retreat, the force must be reasonable and proportionate.
"Yes M'lud I did shoot my attacker as he ran away, because he slapped me in the face" - yup, that's going to stand up every day of the week in court :roll:
Oh, and you may wish to take some of your own advice, re the electrons.
But to help you just a little, have a look at this snippet from the Crimestoppers website:
The law does not allow you to retaliate, for example if you try to punish a criminal who committed a crime against you or your family. Punishing criminals is for the courts to decide and the courts do not accept people taking the law into their own hands.
As I say, I wonder what the tariff is for ABH these days, do keep us posted.
Oh, and yes, I do think you're mentally deficient :thumbright: