This wasn't a kid knocking at the wrong door in the middile of the day.
This was a 2 AM and break in where the guy busted a window to get at the door handle. This is WAY MORE than just knocking or a misunderstanding. I would agree that mistakes or even simple burglary don't deserve the death penalty, BUT... if he was aggressive enough to be smashing things in the middle of the night after banging on the door and windows, then what would he also be aggressive and mistaken about when he got inside? At a certain point being concerned for your own safety is legitmate and we crossed that line awhile ago.