I'm not a racing fan, but my fiance grew up in a racing family, and I've learned a thing or two. People have already pointed out that it was a dirt track, and it's hard enough to steer a car on dirt, but it's also important to note that he was driving a sprint car; sprint cars have a huge freaking wing on the top that make it very difficult to see to the right of the car, especially following closely behind another driver. If you watch the video, you can see Stewart is tailing the car in front of him who swerves at the last second to avoid the Ward who is WALKING IN THE MIDDLE OF THE TRACK (against the rules, for obvious reasons), Stewart, who was behind the guy who swerved, would have had even less time to see and avoid Ward. Even if Stweart pushed Ward's car into the wall on a previous lap, as many speculate he did, that's not something you take care of on the track. i don't know a whole heck of a lot about racing, but even I know that's something you take care of in the pitt.