Often, these are video documentation of bike crashes. I will watch the video, put myself in the place of the bike rider, and say "All right, WHEN does this guy get in trouble? HOW is he going to contribute to the crash? and WHY would I not get into a situation like this?" and see if it comes out like I think it would.
19 times out of 20, the bike rider is going WAY too fast for traffic conditions, going far faster than the other traffic on the road, or taking turns with no regard to what might be just out of view. Very often, when a bike rider encounters a car that "cuts him off" or "turns in front of him" or "tries to run him off the road", it's simply because the bike rider was going so much faster than he should have been going, that the car driver had no reason to think that anyone would actually be there.
Generally, the narrator or subtitles is giving the car driver a hard time for getting in the biker's way, when in fact the biker was the one at fault.
The main exception is when the rider is sitting at a traffic light and gets hit from behind, which is very difficult to do anything about unless you are staring into your mirror with your bike in gear and your hand on the clutch.
If these videos are any indication, the big majority of bike crashes are the fault of the bike rider, not the car or truck or pothole ....
Always trying to improve my chances. The older I get, the longer it takes to heal ....