Something that hadn't occurred to me that a buddy of mine mentioned when we were talking about this...Texas is an open carry state. Nothing that shooter did up until the point he started shooting people was illegal or would have raised eyebrows in Texas.
He could have had a cop (or the mythical good guy with a gun, being Texas and all) standing right beside him, and they couldn't have done a thing to him until he started shooting.
Just...boggles my mind.
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