Other apathetic here. There's a certain amount of background cosmic dice rolls and related instances of suffering all the time. Plane crashes, house fires, robberies, lottery winners etc. Its all just noise. Like a log of lightening strikes. There's nothing interesting to be learned looking at individual instances, and those instances don't really affect your life. The next illogical step in the process is to figure out who or what to blame, but why? You think if they nailed this derailment down to a single thing that went wrong this time, there would never be any more derailment accidents? If the answer is no, then why care so much about where to pin blame?
Derailments of this type have been increasing a lot over the past few years due to premature automation of rail lines and increased length of freight trains. Ultimately this is a story about cutting costs at the expense of lives and the environment.