I have to agree with Shotglass on that point; if a spectator is standing in a stupid spot I do not feel sorry for them.
For a spectator in a more logical spot who is killed in a freak accident, now that sucks. Of course, they know the risk when they are there, though. I feel bad for those who are hit by cars when they're legally crossing the street or just walking down a sidewalk because that's not supposed to be a danger spot. When going to an event (at least here) there is usually signs warning you of the risks. If I get killed in a freak accident at a racing track, thats just a shitty deal. At least I was having fun when it happened; same goes for the drivers/riders.
In any case, it's never a good thing to hear people killed. I'm not suprised by the number (230 in the last 100 years) judging by the nature of the event, though.