When you are that scared, you do not know what you would do!
When you are doing over 90 in a runaway Truck going down a Mountain slope, a Truck Driver must already know his life is not near as important anymore as the lives of everyone else and take the ramp! TRUE DAT! Yes, he should have taken his own life instead of theirs. But that is a decision he made in about 1 second of time. He didn't have much time to think about it.
Taking the ramp is suicidal, at best. Many Truckdrivers are killled taking those ramps- more-so than not. That does go with the job though!
The idiot panicked and made the wrong decision.