I'll say it again...
1) The bikers clearly intended to cause the SUV to rear end him and was looking back anticipating the collision.
2) Once the family noticed that the bikers were following him, why did he drive further into the city? He should have drove to the nearest police/highway patrol station...
I understand that the driver was stressed, understandably, but as others have stated, why then go into the city?
I suspect that there is more going on than what we all have been informed and without the whole picture we are just blowing steam.