Navy has yet to reveal why watch system did not work to avoid collision of Fitzgerald with freighter

NY Times:

A U.S. Destroyer Failed to Dodge a Cargo Ship. Why?

Lookouts and radar operators on the Fitzgerald should have spotted the freighter it collided with, and the captain should have been alerted. But none of that happened, and seven sailors died.

While the radar system should have alerted the crew, a person on watch should have been able to identify the potential collision by seeing the running lights on the cargo ship.  They should have been able to see the port side red lights on the ship as it approached.  The Navy needs to determine if the watch was distracted by something internally on the destroyer or was asleep at the wheel.

Reports indicate the cargo ship was on autopilot.  I suspect the Fitzgerald was too.  But both ships should have had a watch posted and both had a responsibility to avoid a collision.