The NTSB investigates incidents and accidents, and would do what they can to find a cause.
According to the NTSB report, they certainly seem to think there was something fishy.
the average pilot will not likely ditch the airplane within all of the Airbus ditching parameters because it is exceptionally difficult for pilots to meet such precise criteria with no power. Further, the water swell tests conducted on Mercure airplanes indicated that, even with engine power, water swells and/or high winds also make it difficult for pilots to safely ditch an airplane
the investigation revealed that the success of this ditching mostly resulted from a series of fortuitous circumstances, including that the ditching occurred in good visibility conditions on calm water and was executed by a very experienced flight crew; that the airplane was EOW equipped even though it was not required to be so equipped for this particular flight; and that the airplane was ditched near vessels immediately available to rescue the passengers and crewmembers.
Originally Posted: https://www.quora.com/Did-the-NTSB-really-try-to-prove-Chesley-Sullenberger-at-fault-for-landing-Flight-1549-in-the-Hudson-instead-of-returning-to-La-Guardia-Or-did-Clint-Eastwood-employ-a-great-deal-of-artistic-license
Originally Posted On: 2016-09-19