You’re correct in your diagnosis. A neighbor was killed on Easter night a few years ago after a crazy black man he had once worked with ‘remembered’ some supposedly racial joke the victim had told over ten years prior. The crazed black man hired a PI to look up his old boss’s address and shot the victim dead at point black range with a semi-auto 38 as soon as the victim was called to the door by his wife.
The victim was long retired, a happy man, beloved by all who knew him and no one ever knew him to tell such jokes, nor did anyone who had worked with them at that job. He was white.
The diagnosis you made is similar to that used by the dozens of one-off self-trained jihadis we’ve had in the US since 9/11. The same motivation — Islam is the RELIGION of instilling murderous insanities and rages as a ‘victim’ of Infidels in Allah’s pure world.
The victims of these Jihadis tend to be Jewish, but can include any Christian, or just ‘Americans’ in general — viz Fort Hood.
Notice also when they go through the litany of mass murderers, they never mention Colin Ferguson?