It is certainly debatable whether it is wrong to drive through a mob of people attacking you. When threatened, you are under very limited obligation to regard the safety of the people attacking you.
You are obligated to responded with an appropriate level of force, and I didn't see much evidence in that video this guy exceeded the reasonable level of force that should be applied while being beset by a mob. He does not accelerate irresponsibly and drives rather slowly through the crowd. He seems only intent on escaping, not mowing people down.
If you got bumped by his car, it was because you were acting in an illegal and threatening manner.
And yet you still cannot show the protesters posed a reasonable risk to his life. So what, they hit his metal car before he sped off? Oh no...God save that man!
Also pretty sure it's illegal to not stop after you hit someone.
I think it's inaccurate to say "he sped off". It looked like he took a reasonable level of care in leaving.
I'm not sure the prohibition against leaving the scene of an accident requires you to stay amidst an angry mob. I would guess you are allowed to leave the scene of an accident when staying there would present a threat to you safety.