I once had to disarm a woman on the range for nearly doing that and almost shooting a little kid in the face. Arm up and elbow resting in her hand, limp-wristed letting the gun hang to the side 90 degrees while taking a short break, finger on trigger and looked like partial pressure applied. Probably one of the scariest moments on the range I've ever had.
Working as an RSO at an indoor range for just 1 year in an ultra-liberal city that's a tourist destination made me realize something. If you don't leave an indoor range mentally exhausted from hyper-awareness, you're just oblivious and lucky. Maybe I'm wrong, maybe I'm paranoid but, I'd rather be exhausted than "lucky".