Soldato
Personally, it's just the difference between aggressive driving and defensive. I'm a defensive driver so I'd have braked with everyone else and held my position. There is still a car in front of you for reference. Not to mention the road being unlit and chucking it down. If everyone in front is slowing/braking hard, why maintain your speed and look to overtake them all, they are braking for a reason.
Yes, I drive in a similar fashion. I would have slowed down, too, and given the truck more room (just in case) – positioning myself in the outside lane, as a result. Then perhaps ploughed into the black car a few seconds later, heh, but at a lower speed.
Most would focus on the visible vehicles, in an effort to ascertain what's actually going on and where the hazards lie, and completely miss the other car.