Actually it is true everywhere. Unaimed fire has some danger (every year there are injuries from falling bullets on July 4th) but it’s a lot less dangerous than aimed shots. Contrast the 2007 Virginia Tech shooting, which was aimed fire from a Glock, and this poorly aimed mass shooting recently in Chicago, seven wounded and no deaths. Bullets spraying into the sky have a non-zero risk, and they certainly are terrifying to be near, but it’s far different from carefully aimed fire.
In fact the whole reason the US military switched from full auto to burst-limited is because spraying bullets is so ineffective, even when they are going approximately in the right direction. During the Vietnam War there were 50,000 shots for every kill, to give you an idea of how ineffective unaimed full auto fire is and why the DOD stopped it.
Again, everyone who possesses one of these things, even without a gun and without any further intent, should, in my opinion, go to federal prison. The legality of it is a separate issue from the real danger of it.
