So, I stumbled across this story this morning.
This guy, Richard White, a mild mannered meek JW, went on a killing rampage in the NOLA airport.
Interestingly, he had been in the hospital two days before with a low blood platelet count, meaning oxygen was being deprived to his brain since he refused a transfusion therapy for his Hon Hodgkin's lymphoma. He also began feeling paranoid that "people" were out to get him.
So, maybe due to his JW blood refusing beliefs, and continually reinforced fear in the KH of the evil "worldly people " out to get him, he was having a mental breakdown.
This JW connection can very strongly explain the mental breakdown and extreme behavior.
I find it interesting his sister is so adamant in the video that it is a fault of the government not providing enough support for him as a veteran. It seems he was doing just fine with the help he had been receiving, according to her, until this recent behavior.