I still think Stewart got a bit too close to Ward purposely, but didn't intend to hit him. A pothead + hothead = no good outcome.
That's nice, but the evidence and witnesses do not support your thinking.
There were lots of armchair quarterbacks in the original thread that was locked, and in the general (uninformed) public, that were absolutely convinced that he intentionally killed the other driver. Or at least tried to scare him.
They and you are wrong.
Criminal charges were not warranted.
I do not think he intended or caused the crash.
The second half of the incident, where the guy was on the track on foot: if he took extreme evasive action, Stewart himself could have been hurt or killed, or some third party.
Criminal charges are supposed to be about crime. Not about who wins or loses in a social popularity contest.
That kid got himself in a bad place. He had to know that when you come around the track it's difficult to change your line at least enough to dodge some guy standing in the way. You don't see that far ahead driving around the track and the results are what you'd expect.