Fitasc, we can approach it from either a clinical or less specific basis, but regardless, the man was angry, because the truck on the street posed a threat to his driveway. Observation shows that he was wrong, right?
An hour later, the trucks had still caused no harm, but he was still angry. He very quietly fired several cylinders into the vehicles. He was fully in control of his emotions,as seen, no shouting, tremors, shaking. He said that he had shot the cars so that they couldn't escape before the police arrived, but the police weren't coming.
That was very obviously a person who was in control of himself, his actions were deliberate and careful. His actions were, however, made on defective thinking. Several different levels. He even had the delusion that he was simply "holding them for the police", that he had just performed a "citizen arrest".
Whether or not he was mentally defective, or suffering clinical dementia, he did it. That would almost certainly trigger a competency evaluation in some places.
I've worked with mental health professionals for years. I believe that the guy might be a bit dinged. What he did made no sense, one step to the next. I don't think he demonstrated full clinical dementia.
I see absolutely nothing to be gained from jail or prison time.people commit horrible crimes and still wind up without time. Looks like the guy has a nice place, probably no violent or dangerous history, nothing I'm seeing indicates that he poses a threat to the public, right?
Just what I can see, he was released on a minimal bond. The situation, to me, doesn't call for a long punitive incarceration. It wouldn't serve any purpose, would it?
I believe that the best solution is keeping him out of incarceration, under supervision, and keeping him in the court system. If he pleads to a five year sentence with parole, he will be supervised for five years and subject to arrest if he "loses it" again.