Maybe stupid isnt the right word, ignorant is more like it.
i.e. A professional dancer that does not know how to use or maintain the guns used by cops is ignorant. A cop that doesn’t know how to use or maintain his gun is not just ignorant. He’s stupid.
These reporters are, quite literally, stupid - or they have an agenda and think their audience is stupid.
My take:
Stupidity is not being able to think properly, to have a mental handicap.
Ignorance is not knowing something one could learn, or was never taught.