The markings on the bullet casings make the motive pretty clear. Maybe it's an attempt to deflect suspicion, or otherwise misinterpreted, but Occam's Razor sugg

The markings on the bullet casings make the motive pretty clear. Maybe it's an attempt to deflect suspicion, or otherwise misinterpreted, but Occam's Razor suggests a pretty high confidence that the motive is directly related to the guy's job.