What Bible principles and scriptures apply to a situation where self-defense results in the death of the attacker?

Related but not answered: https://christianity.stackexchange.com/questions/3734/when-do-we-as-christians-draw-the-line-on-self-defense?r=SearchResults Context: South Africa has a rather high rate of crime, far, far, far higher than America, Canada, or Europe. Please leave these references in as they are important for where I am coming from with this question. If a Christian believes in self defense and kills an unbeliever who is breaking the law by committing a crime and about to rape or kill themselves or a family member or friend, is the burden of that person going to hell on the Christian? Should the Christian have at least tried to present the gospel to the person - as ridiculous as that sounds? Should the Christian let the unbeliever kill or rape their family or children (read the news in South Africa 😭) knowing that their family is born again and will be face to face with Jesus when they die? What about God's plans for their family's lives? What about God's plan for that unbelieving criminal's life? I understand that we as Christians are responsible TO people, and not FOR people, but I don't know how that applies in this area please.