well, that wouldn't be a problem if the other people didn't have them either
The conditions in which a SWAT operative uses a shotgun and how any other gun owner in the world uses a shotgun are unfathomably different. Police and SWAT, despite intensive training, are still more prone to a firearm mishap than other situations because the situations in which Police and SWAT use guns are often in intensive, stressful and rapid circumstances which they are obligated to be involved in. It's a dangerous line of work, this stuff happens. Steel mill workers also end up getting injured from time to time despite intensive training because it's their job to constantly be in dangerous situations.
Whereas a gun range, you're just pointing the loving thing in a straight line in a room that's engineered to be safe. Whereas in a home defense situation, the vast majority of the time the gun owner doesn't even need to let off a shot. Whereas in a hunting situation, the pace is slow and people take time and effort to look out for each other. Whereas in a recreational situation, I mean, do I have to keep going?