I'll be the first to admit that I don't know all of the facts here -- and we may never know the driver's actual state of mind -- but it's looking more and more like the fatality in this incident may have been at least a Darwin Award contestant, if not an absolute winner.
“I’ve seen some speculation that he smashed into the car in front of him because the crowd of people obscured it from his view.”
Typically, when you are driving a 3,700 pound vehicle and your view is obscured, you stop the vehicle.