they should be happy to be alive...
Well, they paid for a safe journey and they came close to buying the farm. The fear and stress must have been unbelievable. It may have been excellent skills by the pilot and crew but if were me I'd rather not have to find out just how good the pilot is.
With regards suing US Airways given the States legal process it may simply be the due process for getting an agreement on compensation and how it is measured.