The captain is responsible for the safety of the passengers, crew and ship, this being a professional mariners forum I assumed that didn't need to be said.
As far as blame or Schettino's legal situation, that's outside my area of expertise.
. After the outcome is clear, any attribution of error is a social and psychological judgment process, not a narrow, purely technical or objective analysis.
•Richard Cook and David Woods
The fact that Schettino may have believed he faced an impossible situation is useful information that increases understanding. It's a technical point, not a judgment process.