Society holds life to be sacred, abhors the killing of human beings, and considers premeditated killing among the most offensive of crimes. However, killing may be justified if it is necessary to prevent an act that is as or more offensive than the killing. The law of self-defence therefore justifies killings that are necessary to defend oneself from death or serious bodily injury.
5.5As noted in Chapter 3, self-defence is what is called a “justification-based” defence. It means that any person who successfully claims self-defence was morally justified, and blameless, for acting as he or she did. It is an exception to the criminality of the act.