If an injury has to be done to a man it should be so severe that his vengeance need not be feared.
Niccolo Machiavelli (1469 - 1527)
Keyword is "If". In a SD home scenario, the intent of the BG is not known, but he's in YOUR house. Assume the worst and defend yourself and family.
As others have posted, center-mass may be all you see. Adrenalin, stress, fear, won't provide you the "chance" to think about anything else but targeting the largest area on a body and STOPPING the threat.
The vengeance is the civil suit to follow a shooting to pay for the BG's medical bills. It's been tried before.
"Don't hit at all if it can be avoided, but never hit softly."
Theodore Roosevelt