Don't want to sound rough but I think that's a lost case there. He appears to be extremely limited in his mental capabilities, seemingly unable to grasp the mere concept of hilarity. Let's all be more supportive and gently smile at his attempts to post funny videos.
Bit of both imo. The driver in front could have been more cautious re-entering the track after losing control. The driver behind could have been more cautious passing a car which could be seen as out of control.
Tough call, don't know about the rules on re-entering, but it seemed obvious that the car that was off track was coming back on, the on board car could have avoided him I think.