I know someone who bought some guns to protect himself and his wife. He got a concealed-carry license and did all the legally required training, plus additional classes and training. He has been shooting for fun every few weeks for many years now, he owns a few pistols and a shotgun. He's a very kind, responsible man and I fully trust that he knows how to use his guns.
Over the past several years he never had cause to use any of his guns for protection, however. Quite unexpectedly, his wife left him this year and sent his entire world spinning. He was a devoted husband and now he is beside himself and nearly out of his mind with grief and anger and hurt. Now that small arsenal is a source of constant uneasiness and worry for everyone who knows him and his wife, and we would all probably feel safer if it had never existed. It only takes one night, after a few too many beers ...