LEGAL PRINCIPLE: CRIMINAL LAW – Self-Defence – Proportionality of Force
PRINCIPLE STATEMENT
In order to rely on self-defense as a defense to a charge of murder, the force used must be proportionate to the force used or threatened by the deceased against the accused and reasonable in the circumstances in which it was used.
RATIO DECIDENDI (SOURCE)
"In order to rely on self-defence as a defence to a charge of murder, the force used must be proportionate to the force used or threatened by the deceased against the accused and reasonable in the circumstances in which it was used."
EXPLANATION / SCOPE
Self-defense in murder cases requires strict proportionality between: the threat faced and the defensive force used. Courts assess: (1) Proportionality: Did the defensive force match the threat’s severity? Meeting deadly threat with deadly force may be proportionate; meeting non-deadly threat with deadly force is disproportionate. (2) Reasonableness: Would a reasonable person in the circumstances use such force? This considers: immediacy of danger, alternatives available, accused’s perception of threat, and heat of the moment dynamics. Disproportionate force defeats self-defense even if some force was justified. For example: victim threatens with fists, accused responds with deadly weapon—disproportionate. However, apparent threat severity matters—if the accused reasonably believed they faced deadly threat (even if mistaken), proportionate response to that perceived threat may be justified. The assessment is contextual, not mechanical. This proportionality requirement prevents self-defense from becoming license for excessive violence, ensuring defensive force remains truly defensive, not retaliatory or punitive. Complete self-defense requires proportionate response; disproportionate response may reduce murder to manslaughter but doesn’t excuse entirely.