YOU've obviously never been to the mountains on a motorcycle. Passing on a double yellow when there's enough visibility is par for the course.
BUT..from that angle, he picked a bad place to pass (limited visibility), but it was his (lack of) riding skill that put him into the weeds. Fixation is a bitch. "You go where you look"...and he was looking at the ditch.
I'm gonna guess based off the sound and what you can see, they were driving a VW van.. Probably some tree-huggers..

They're scared of everything.