There is such a thing as "dodging a bullet."
And there is also such a thing as "denial." It's like the Space Shuttle program-dodged enough bullets that complacency set in. (Twice in NASA's case.)
Now, I'm not saying we should stop racing there, but we should keep racing there only if the track fencing can be made safer. And honestly I think there is a way for fencing at ALL oval tracks to be made safer. Just a matter of finding it.