It was obviously the gun's fault.
Everybody knows AK-47s go off by themselves all the time, it's just in their blood. When was the last time you heard of a non-menacing, non-evil AK-47?
Old Winchester .22s however, can't be fired when they're being pointed at humans, it isn't some fancy technology, they're just not assault rifles. They don't assault people, they just shoot holes in paper and squirrels.
Suggestion: Avoid letting other people's daughters become victims by telling their folks to be decent parents and not to let their daughter hang out with idiots.
Ya screwed up mom.