Is he really that scared? He's lived 5 mins away from me for the last few years, not seen any security, any protection. His wife drives out in several cars fairly regularly. None of it shows the slightest 'real' concern and that is because these threats are made by dribbling idiots probably incapable of navigating to his house without assistance.
Seriously, if I was that concerned I would have security on my gate and patrolling my low roadside wall, especially at night. I would have trained drivers schooled in avoidance. He can afford all of this, but there are sign of none of it. Only thing was beefed up gates to stop stupid school kids annoying them.
You do do the maths.