Chaos has always made strange noises, even from when it first opened (at least the one at Cedar Point has). If you just picture what the ride does, working in so many different directions, it must have incredible forces working on it. Accidents are never inevitable, but they do happen, and it is terribly unfortunate when they do. We can be thankful that this isn't even worse.
On a side note, I can understand why they wouldn't close the park down entirely when such an accident occurs, as horrific as it is. You have to consider the other hundreds+ of guests that have paid their admission and want to ride things other than Chaos. While it may seem cold-hearted, it is, in part, an economical decision.
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/