I think that is a rub. With the goal just being to find some variables that correlate together, it is a neat project. But, ultimately not indicative of a predictive classification. If only due to the fact that you do not have any independent samples to cross validate with. All samples being from the same crash.

This would be like sampling all coins from my pockets and thinking you could build a predictive model of year printed to value of coin. Probably could for the change I carry. Not a wise predictor, though.