I'm too lazy to try to find the circumstances of her father's death, so I can't ask "but what if he had had a gun?".
She grew up on her parents’ farm in Benoni, near Johannesburg.[10][11][12] On 21 June 1991, Theron’s father, an alcoholic,[12] threatened both teenaged Charlize and her mother while drunk, physically attacking her mother. Theron’s mother then shot and killed him. The shooting was legally adjudged to have been self-defence, and her mother faced no charges.[13][14]
https://en.wikipedia.org/wiki/Charlize_Theron#Health_concerns