On CNN just now, the ding-dong ditch suspect had over 20 guns in his house.

[Heidi]

8. The story your acquaintance clings to is a well-debunked myth.

Conclusions: Guns kept in homes are more likely to be involved in a fatal or nonfatal accidental shooting, criminal assault, or suicide attempt than to be used to injure or kill in self-defense.

Kellermann AL, Somes G, Rivara FP, Lee RK, Banton JG. Injuries and deaths due to firearms in the home. J Trauma. 1998 Aug;45(2):263-7. doi: 10.1097/00005373-199808000-00010. PMID: 9715182.
https://pubmed.ncbi.nlm.nih.gov/9715182/