The driver wasn't racing and wasn't involved in the street race. Apparently, tyre smoke from the street racers obscured visibility which meant that the driver couldn't see the crowd which had spilled out onto the highway to watch the race. Now, you can certainly argue that the driver should have slowed down when they saw the tyre smoke and that if they had been traveling more slowly they would have been able to react in time to avoid plowing into the crowd. However, based on what appears to have happened, my view is that the driver isn't really culpable and that those who died were killed more by their own stupidity than by the driver's recklessness.