If the state knew of the danger and didn’t do a thing to prevent it other than a letter, there is precedent especially if the authorities stated the danger yet made no effort to prevent harm. I know of an animal bite case where the state identified a dangerous dog and didn’t move to protect the public and the dog took off a 5 year old girl’s face.
by that reasoning a State could be sued everytime someone is killed with a gun, because Democratic lawmakers all the time tell us how dangerous guns are, and that people having them is just an accident waiting to happen.