Not talking about you here, but with many people, the simple fact of owning a gun seems to mess with their judgement. Back on reddit, there was this "AskReddit" thread about who had killed someone and how they felt about it.

Two stories stuck with me. The first guy woke up and heard two men in his living room. He grabbed his gun and went to investigate. The guys who were in the process of taking some of his stuff heard the noise and one of them told the other: "Shit, someone's here. Let's get the fuck out!". At this point, one of them was shot and killed by the homeowner. The other managed to get out. Had there been no gun involved, nobody would have been hurt.

Second guy also wakes up one night and there is someone messing around in his family's house. Family's on vacation. He thinks it might be his uncle, so he calls out: "Hello?". The intruder, definitely not his uncle, responds by rushing at him with a knife. Second guy turns around, runs for his bedroom, grabs his gun and manages to shoot the madman, who dies before emergency services arrive. Had no gun been involved, a perfectly normal guy would've been stabbed by an insane burglar.

Moral of those stories? No idea.