I suppose the premise of their argument, in filing, would be that the passengers had a "right" to make it to the destination unscathed. Airplanes do crash, this isn't the first, nor will it be the last. Loss of life is always tragic, no matter the capacity, but it does happen - and last time I checked the mortality rate was still 100% although causes vary. I say, bad form from the families that are filing (at least right now). (And yes, I have lost loved ones in tragic accidents)