yeah that scene wouldn't even make the final cut on a b-budget movie.
par for the course. Nearly every major televised event of the last 70yrs has been faked or pre-planned and allowed to happen for sensationalism.
This is the world we live in. The reason you can't imagine anyone going crazy and just randomly shooting up innocent people is because it doesn't actually happen. It's a means for a select group of "people" to extort money from good people who donate to such events.
Here's the responding officers at Parkland in Florida removing the evidence that linked them to that hoax. Real people die, but not at the event. You die when you speak out.