Not to justify the A-Hole's performance. However I live on a very pleasant drive, the east boundary of our older residential neighborhood, that meanders along the Intracoastal Waterway for 6 miles. The speed limit is 25 mph for the whole 6 miles.
Twice a year, in the spring during Bike Week and then again during Biketoberfest, we get hundreds of bikes riding through. The guys on the cruisers are generally well behaved though noisy as heck at times; however most the crotch rocket riders make me wish I had a cache of LAWS rockets.
They blast by at 60+ mph, two or three abreast, pulling wheelies in the straights, with complete disregard for anything except their own rice-fueled dreams of being Speed-Racer. I told my wife that I was going to string a pop-up steel cable across the road.
You had mentioned that the area is one frequented by bikes, this guy may have just been pushed beyond that edge we all have...