A traffic law designed to keep people safe. Suppose he wipes that bike out, goes into someone's yard and through a swingset full of kids. The riders put lives at risk just as the truck driver did you blithering idiot. They riders and the truck driver are all assholes, IMO what the truck driver did is terrible but no worse than what the riders were doing. The riders could have easily killed someone on that road. Put them all in jail.
We have no real idea how fast they were going.
Even then, please don't tell me you eat up the government's bullshit about speeds and safety. 65mph is slow, it's about average speed and safety when combining multiple parties, plus highway speed limits are roughly the most efficient speed to travel long distances - in terms of MPG.
But sometimes more efficient use of time is better than more efficient fuel use, at least imho.
If you actually
know how to drive, speed limits are irrelevant and the signs can be ignored - unless you are worried about cops and how fast over the limit you could be cited for - which is the only thing that usually slows me down.
With weather, things change. But sunlight, dry road, good pavement - driving is easy if you know how to handle the vehicle and can understand it's language.
I am most certainly NOT arguing that speeding on country roads that are all curvy and running through towns is a good idea... but it's not a "think of the children!" fear-mongering event, sorry... it just is not so. 100 on such roads, not cool imho. 70, 80? Cake, if you know what you're doing.
Half the drivers out there who speed fall into the category that includes, oh I dunno, roughly 75% of drivers out there - people who really don't know how to drive, the type that treat driving as simply something to get from one place to another, simply another tool.
Well, it is a tool, but like most tools, you should fear it, respect it, and always, always always, attempt to master it. And that's each and every vehicle.
Most drivers scare the shit out of me, to speak honestly. Most are so damn foggy headed behind the wheel, they are simply thinking about what they are heading to, or who knows what. Few actively listen to what the car tells them, because half the time, it's hard to make the vehicle talk about it's limits when you are nowhere near limits on most occasions - and knowing those limits is extremely important.
edit: also not arguing to always drive near the limit. That's called racing, and there IS a time and place for that - and that ones more simple: it's not on any public road, at least, not if those public roads haven't been closed down for such an event.