Sending an empty train during a downtime is a stressful situation? These kids wouldn't last 1 day operating a fast-paced Disney attraction. Also, whether or not the child was in direct danger is completely irrelevant. It's a safety policy violation and trying to justify it is dumb. Period! To be honest, the way you're defending them makes it sound like you work on said crew. I'm sure the park's management reads these boards so they already know probably.
Universal and Disney are 2 theme park operators that allow guests on the dock of coasters when trains are in motion as long as they're past the yellow lines. SF and CF do not allow guests on a coaster dock when a train is in motion.