Most states DO have this. It's called "brandishing." Exposing the firearm for the purpose of intimidation not related to a defensive reason.
The thing is, if you get punished for pulling it w/o using it, you'll end up with a lot more people shot in the back. Why? Many times simply pulling a concealed gun ends the threat: the idiot threatening you has a sudden stroke of intelligence and bolts or submits. Thankfully, a lot of things can and do change in the half second between breaking leather and presentation on target. That saves many idiots' lives.