Well this is a tricky one.
The driver claims there was a car crowding him off the road... I don't doubt it.
I was driving home from school one day on the freeway and I was in the middle lane. I could see brake-lights up ahead in my lane so I picked an opening in the left (far-left) lane and moved over. I kept my speed and began to pass a big white pickup trick (Ford F250ish) in my 1988 Toyota Corolla (Small small car). I was about parallel with the driver of the truck when all of a sudden I found myself driving in the dirt/asphalt strip to the left of the freeway, with a concrete barrier not 1 foot from my left fender and my left tires on the dirt and my right tires on the 2 foot of asphalt on my side of the far-left lane.
The guy in the white truck had moved over RIGHT ON TOP of me and I *reflexively* moved out of his way to avoid a high-speed accident. This all took place at about 70mph. It was surreal how I didn't even think of moving over - I just did it.
The moral of my story is... if there really was another car forcing the trucker off the road, then I couldn't say that he should bear the brunt of (and responsibility for) killing the two bikers.
Naturally there aren't very many pedestrians or bikers in the middle of the freeway between the concrete barrier and the actual road... but if there had been I don't know how my experience would have played out. The white truck that took my lane might have sideswiped me, and perhaps caused a massive pile-up, or perhaps would have driven me off into the dirt like I already described, forcing me to hit the civs. In either case I don't think I should/would have been held responsible for that... the white truck wasn't paying attention and was 100% at fault, not me.
If there was no "other car" (one armed man?) then the truck driver shouldn't be allowed to drive and perhaps should face manslaughter charges and I agree, $2000 surely isn't enough.
But what if there was another car?
Also, think about the psychological impact this must be having on this guy... Having killed 2 people... In some cases that would be punishment enough.