I was thinking this could have been avoided if the emergency exits had alarms. But even then, everyone would have been outside and the shooter would have had an even bigger crowd to fire on, although he may not have been able to blind that big of a group with his tear gas. Maybe if someone carrying a concealed weapon had ignored the theater's policy the damage could have been mitigated. But the guy was pretty well decked out in protective gear. I just wish there was a way to prevent stuff like this from ever happening, even though there just isn't.