Not all the facts are known, that said, in my view it was just a matter of time. In Texas alone there are now over one million people with a carry permit and there are nervous LEO's out there, and rightfully so. They now have a target on their backs....I have a daughter, daughter-n-law and a cousin in active law enforcement and having met some of their co-workers and can tell you there are some that feel John Q. Public has no business carrying a firearm. This attitude and the apprehension on our LEO's and a momentary lapse in judgment of a carry holder could lead to this happening.
I have been pulled over twice by police and have not experienced any unreasonable request by the officer in question after identifying myself, but, I can see how it could go very wrong very quickly. I switched the back pocket where I carry my wallet to the opposite side I carry my weapon just for this reason. In both cases of being pulled over the officer and trooper asked the location of my firearm and I responded and then informed the LEO as to the location of my ID. I keep my strong side hand in view and inform the officer I am getting my ID as requested and move very slowly. Since those stops I now will have my ID ready when the LEO reaches my truck with both hands in plain sight.
This was a terrible tragedy and I pray God will help the ones directly involved as well as those close to them that must help them work through this.