I was going to post some of the same things that powercreep posted. Very excellent points. In addition, I'd like to add:
1. It's hard to see out of those cars. My uncle raced for about 20 years, and he says that sometimes you can't even see the front tires in your car. And with the way that the wings are nowadays, with the right side hanging so low, it's very hard to see out of the right side of the car.
2. Track conditions play a large part in the handling of the car. Depending on how late in the race it was, how much rubber was on the track and how wet the track was, the car could handle well, or like shit. And from the video, I think it's hard for anybody to definitively say what track conditions were that night.
3. Air conditions play a large role as well: mainly, how dusty was it? I've been in the stands before where I couldn't even see the other side of a half mile track because it was so dusty. Sometimes it's better on the track, sometimes it's not. That further hampers visibility. Plus, we don't know if Tony's helmet was clean or not. Last Thursday Brian Brown won at Knoxville, but ran out of tear-offs in the process. I'd like to know if Tony wasn't in a similar position.
So, were tempers running high? Of course. Does Tony Stewart have a perfect track record? No. But don't be so quick to jump to malice. Driving one of these cars really isn't anything like driving a normal car, and that has to be taken into account.
Again, I don't think any of us will ever truly know what happened on that track. But at this point, I don't think there's enough evidence to convict Tony Stewart of anything. He'll probably get a fine, and they'll probably ask him to sit out a few races to appease the mass media, but that's about it.
Even though I know it will probably happen, I really hope the general public doesn't stick their fat noses in racing business, forcing a bunch of new rules to be created for 'safety'. All of the additional rules are what killed Nascar, and I really hope they don't do the same to sprint car racing.