My point of view is that it was definitely negligence from the pic.
Its not a mere turbulence which they have encountered...its a crash.
And the capt seemed to have opted for a definite landing rather than the best-and-needed alternative=to go around (even after the first bounce)
Recently an Air mauritius A340 bound to hong kong encountered severe CAT-turbulences well before approach descent. Many people were injured.
That was it...a clear air turbulence..but yet so many people wanted the head of the capt and were on the process of suing.(even the capt was injured)
There is a logic upon to whom responsibility is to be attributed a crash or severe incident.
In the 737 case...neglecting 15 warnings recorded on FDR and first officer 'recommending' an alternative (recorded on the CVR) already burns your alibis