I see many motorcyclists doing this but it is not the majority of riders. I’ve started reporting dangerous driving, aggressive driving, dangerous passes, and high speed drivers to police. On major or regional highways it is often effective as I’ll pass them pulled over later, results in towns/cities are less reliable due to traffic and more route options.

For the bikers I consider it a favour to them, one I called in was practically asking to get flattened by a semi truck, riding the line while tailgating people waiting to pass. Even if they don’t hit anything their erratic driving could cause another driver to panic, swerve, or brake and could cause an accident.