My point all along is that he is a lunatic, i.e. is likely suffering from some type of age related dementia.
He appears to be suffering from iamgoditus which is common in law enforcement and your argument that his training should have prevented his actions if he were in his right mind is countered by the number of police who are "in their right minds" who act like he did and worse.
If you want to argue that police training, especially that given to "tactical" types produces iamgoditus dementia I might agree.