I'm not sure about this. The risk is indeed remote and the benefit seems obvious: the information could be used to design (and teach the design of) structures that are much less vulnerable to total progressive collapse under accidental loads (like fire and earthquake). Making data available to the whole community of scientists is generally good for science. And what seems to be needed here is more and better science.while the risk may be very remote, the potential damage would be very high and, on other hand, the benefit to releasing those files would be very low.
I tend to agree with @Henkka that the reticence of DOT to release the data is a red flag about their own confidence in the quality of the data.
(But I think this will need to go in another thread if we want to pursue it.)