You are amazing, I'll give you that. You issue a proclamation that everyone doing the same 'safe' speed limit would be the best option. You are shown real-world evidence to the contrary. You then claim that it's anecdotal! What happened to the utopia created by your safe speed limit and total adherence to the law?
Is it one example? Yes. Is it anecdotal? Perhaps, but the thousands of cars on the road in question is a healthy statistical sample. Why do you refuse to concede that the film, its content and outcome may call your viewpoint into question?
Your sidewalk example is irrelevant, by the way, so no response required.
OK. Have it your way. It is obviously your contention that the roads are safer without a speed limit and everyone drives what they feel is a speed they can handle.
Therefore, put it to your representatives and change the law.
BTW, if you think that one video is enough to counter the many many accidents that have been caused by speeders, you're nuts.