It's a miracle it wasn't worse indeed. Thirty four cars at 225+ MPH flat out on a freaking track designed for Nascar almost HALF THE SIZE of Indy500 was an accident waiting to happen.
For starters, those cars, just like F1 (which have much more downforce), shouldn't exceed 200 mph IMO, especially on an oval track with banked turns. I see some heads rolling over this. And/or some changes too. RIP DW.