none of these guys were doing 150..

Yikes. It's amazing that there was only one likely fatality that I could see (the car that went off the side of the mountain). Looks like a whole bunch of:

Stupidity.
Driving not just too fast, but WAY too fast to maintain control.
Wet, snowy, or dirt roads or maybe all three = no traction. Duh.
Don't let off the gas, not ever!
Let's make sure we get this on video even if we get run over.
Often non-existent spectator protection. Multiple times the car crashes into the guardrail while idiots stand behind it not even trying to get out of the way.

This is the Darwin Awards at work here...:steering: