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Cops or someone dropped the ball on this one. The offender sent threatening texts to the mother- in-law,
"they pointed to the gunman’s issues with his relatives, saying he had sent “threatening texts” to his mother-in-law."
"Kelley had sought and failed to obtain a permit allowing him to carry a concealed weapon, officials said. He had an “unarmed private security license” akin to what a security guard at a concert would have," read more
If the mother-in-law reported he sent threatening messages, the police could have investigated and possibly held him until a court hearing, and meanwhile searched the gunman's abode and vehicle for firearms, this mass shooting might have been preventable. To tell authorities after the fact would have been too late. Who knows? The media hasn't been informed when the MIL told the police.
Writing from past experiences, a friend of mine was threatened by the father of my friend's daughter for running his son off of his property. The police responded immediately and told the gentleman that if he went to my friend's home or made further threats, that he would be arrested. That situation was handled very well.