This video showed a wide sidewalk or bike path. Why weren't they riding on that instead of the highway?
They weren't riding on a highway. They were riding a low traffic density 35 MPH road approaching an overpass. The sideWALK ended just a few hundred feet from where they were.
I don't like the littering, but bicyclists arrogance is worse than harley riders. The bike riders were breaking the law, and being chunts, because that's what they do.