I have to go with the deceased driver is mostly at fault here. You never climb out of the car unless you are in more danger by stayi ng in the car until safety crews arrive. His death was a sad result of his temper getting the better of him.
In the video I saw a driver out of his car and walking with purpose down the slope of the track into the path of oncoming cars. That makes this, for me, more suicide than murder. Just sayin.