You are talking about the Luby's massacre in Waco. A young woman was there with her parents. She sometimes carried a gun, but this day she left it in her glovebox. I don't remember about her mother, but she watched her father die. She testified when the Texas legislature was considering the right to carry law. As she hid under the table watching this lunatic pick off people at random, she would have had many opportunities to kill the guy.

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Order without liberty and liberty without order are equally destructive. - Theodore Roosevelt