Rocks on the road, rocks in their heads

[beige_alert]

While driving home I saw in the distance something on the road. I slowed down, and when I saw that they were large rocks scattered across the road I stopped, pulled over, and got out to clear the road. The motorist behind me also stopped and helped clear the road. As we did so, several people passed by at high speed in the oncoming-traffic lane. They managed to avoid hitting anything. So, you’re driving at night. Two cars ahead of you have stopped. Do you stop too, assuming that something, some hazard, caused those motorists to stop, or do you pass at high speed, certain that they stopped solely to annoy you, that it is inconceivable that the road could be blocked?