I can see how something like this happens. We're talking about a 5 year old kid seeing something at school, and describing it to their parents. Who knows what the kid said?

Then you have situations like the young kid that did bring a gun to school and shoot a teacher, and there were tips not followed up on, and the school getting absolutely dragged through the court of public opinion because of it.

So, the adults in this situation are in a difficult position. They've got 5 year olds telling them things that are very unreliable but very concerning, and they do need to actually consider that 5 year olds might have guns.

What happened to you is probably the best case scenario: kid told their parent something incorrect, that parent calls the school, the school checks in with you, you tell them they're wrong, the end. If the principal actually thought there was a problem, I doubt she would have simply called you.