It’s obvious that you have never driven (well) on ice or snow.
Oh? Try 50 winters in Ohio.
Fact, everybody was traveling too fast on that road.
Fact, the truck driver did have time to take evasive action without necessarilly harming others, but he was oblivious to what was happening.
Fact, the other drivers managed to come to a stop on the side of the road after the accident.
Watch the video at a good source and pay attention to the other drivers and the road conditions; everybody was driving like it was May.