Death and valor on a warship doomed by its own Navy

In all the analysis of Navy accidents nobody raises this point except merchant mariners. The question basically why doesn’t the Navy operate complex warships like merchant mariners operate box boats.

Navy destroyers, cruise ships and drill rigs for example are not operated with 20 people but box boat are.

Imagine if the discussion of the DWH had been mostly mariners claiming that the crew should have been 20 instead of 120+. It would have been a low-quality discussion.