The article says the shooting occured at the foot of the driveway, the term foot leaves alot of vagueness as to where exactly the foot is. The way I interpret it is at the end, such as the foot of the bed. I could be mistaken, and for arguments sake lets say the foot of the driveway is at the end closest to the house.
How far is the average driveway from the front door of ones home? Definitely more then 3".
The lack of anything mentioning the mob threatening to burn down/destroy the Whites home tells me it was never said, as it would have been a key component to the defense, or at the very least justification for the Governor to commute the sentence.
The reason to cower in your own home is because unjustified man slaughter to prevent property damage awaiting law enforcement to arrive, in most states IS the legal way to go about things. People can feel all the right in the world to go outside and shoot a perpetrator but if the laws aren't written to allow such behavior it is a crime and reason justified or not doesn't lessen that fact. If someone lives in a location where they do not agree with the laws they should move, or at the very least try to change said laws.
Taking the fire arm outside to confront the mob was the wrong decision to make, and the eventual death of one of the mob whether Whites intentions when he brandished the fire arm was a consequence that deserved punishment. The appropriate length of said punishment is something that is best left to those who have had all details provided for them, as in a courthouse with appropriate representatives for both sides. From what I've gathered his sentence falls in line with manslaughter (varying from 12 months to 5+ years depending on the details).
I find this situation unfortunate, as it appears to have been a tragedy that should have and likely could have been avoided, and the lack of information provided to the public is allowing others (all of us) to form opinions on only part of the story and making it a more heated discussion then it should be.