"Yes your honor, after he grabbed my daughter's softball bat next to the front door there and started swinging away, that was when I drew my pistol and stopped his ruthless cold blooded attack on my family."

Sounds good enough to me.

Of course, I could just shoot him upon entry and be done with it, but where's the challenge in that? I guess the question is do I wait until he presents a suitable threat to initiate my defense, or do I just figure once he's inside that his intent all along is to do us in and smoke him where he stands?

I know which one I will pick every single time. I haven't had to put that play in motion as yet, somebody out there is lucky they haven't hit my place.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)