Nonverbal communication exists. Breaking into someone's house, especially at night, is telling the people inside, "I'm here to rape or murder you."

Sorry, but victims have a right to defend themselves. They have a right to use lethal violence to defend themselves. You break into someone's home and threaten the life of another? Getting shot is perfectly proportionate. "Grossly disproportionate" my ass. Lethal violence is a perfectly proportionate response to rape and murder.