Oh, come on, you're being willfully ignorant if you believe there is no relation between the two.

Sure, the buyback plans were made before the derailment, but the fact that plans haven't change shows how little they care about the victims versus their profits.

Even ignoring individual blame, there is the question whether as a society we should allow corporations in general to distribute huge sums of money to their shareholders after a fiscally-significant incident like this. Victims will require compensation, probably for decades. If the company reorganizes or folds in bankruptcy -- which seems somewhat likely -- we the taxpayers will be stuck holding the bag.