It is quite possible that the gun in question was not publicly known about until after the shooting.
Also we don’t have any verification that RC was sleeping outside her stall, with or without a gun, except from LK. And if it was true she was sleeping outside her stall, we don’t know why. It might have been colic. She might always have a gun in these cases because she is an older woman sleeping outside at night. Who knows? Psychiatric workers can be very conscious of personal security because their former clients are unpredictable, though I’m thinking of people I knew who worked with the “criminally insane” in secure units. Not just on the “sixth floor” of the general hospital.
In other words, we have seen enough claims from LK turn out to be unsubstantiated, to put it mildly, that we should not believe anything that can’t be verified.
I suspect that if the police knew there were guns on the property they might have acted differently. I dont know if LK had guns on the property, but if so they apparently were not in use during these incidents. If she had guns, her father and boyfriend could have disappeared them and anything else during their visit to the farm after the shooting. And I am sure MB did not disclose that he had access to a gun.
Of course it:s foolish to think in the USA that no parties to a dispute have access to guns, since guns are so common. But from the outside this may have looked like the kind of dispute where no serious injury would be done and the parties had the resources to resolve this with lawyers and court orders and notices.