This study is very deceptive and uses a small model that they claim represents the whole nation, which is very inaccurate. They surveyed 10,000 people that they very carefully targeted (as most researchers do before surveys) with pre-determined demographics. This is just another lobbyist tool to gain funding for their master. Do a real study that represents the nation far and wide because 1 in 15 people witnessing a mass shooting is not true.

https://www.colorado.edu/today/2025/03/07/1-15-us-adults-have-been-scene-mass-shooting