When a dad has a gun on you and has called the cops, you should freeze and wait for them to show.
I don’t disagree with you at all re: the kid’s actions. Or perceived actions. I wonder if the dad could have intimidated the boy with words along with using his gun and dialing the police. No doubt in my mind that my dad could have. There maybe more history here than we know.
I can well see how everyone in the situation was jumpy.
But...boys’ have been sneaking into girl’s room since the beginning of time. It’s not a new thing.