re: Gunman simply walked into school. No armed guard interacted with him

quote:

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This looks like a massive failure of school security. No one should be able to just walk into the back entry of a school and into any classroom.

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Yep. The left was trying to push the armed guard story to bolster their claim that guns and guards can’t help, but it appears, they jumped the gun.
The police officer being interviewed also said all the shooting was over in minutes and no further shooting went on after the initial barrage.