[Jane Long]

How so?

[thefactor]

Let's take a major incident as an example: the killing of Osama bin Laden. Yes, the SEALS pulled the trigger that day, but you had Army SF, 75th Rangers, and all manner of supporting units forming multiple security perimeters. They didn't all just run towards the compound and start shooting.

In the Texas scenario, there MIGHT be some legitimate issue with the initial officers on the scene failing to chase the shooter in a timely manner. We don't know for sure yet but from what I'm hearing, some USBP agents went in while some local cops stayed outside for unknown reasons.

However, the officers who responded later needed to set up a perimeter. They have no idea how many shooters are present. They have no idea who the parents are and who the possible threats are. You cannot have hundreds of cops streaming into a building with guns blazing. There were many cops breaking windows pulling kids out of the school, but the shooter was in the one classroom shooting out the window. At some point the arriving officers needed to keep people away from the gunfire.