However, if you want to debate along that line..... the response to a transgression must be proportionate to the transgression. If you stole candy from me, I am not allowed to beat you to death out of anger. If I tried it but got killed in the process, you should still owe me candy, but you should not be punished if the homicide was necessitated by self defense. You cannot be expected to have to forfeit your life for a minor transgression.
As stated above, one's defensive action must be proportionate to the transgression.Ockham's razor applies. But if you like you can try applying your above principle to your own scenario and seeing how it undermines the fundamental right to self-defense in any case.