50000 ton merchant vessels do not change speed or direction easily, so their courses are fairly predictable. Modern warships are designed to not show up on radar and be generally stealthy. As such, with their vastly more powerful radar and ability to maneuver, whatever the rules of the road, it is up to the stealthy military ship to keep out of harms way. If their crews training has taught them otherwise, some retraining is in order.
There does seem to have been a lot of it about lately. In recent years, there have been air crashes where the airliner crew were managing the systems that fly the plane, rather than actually flying the plane. Thinking of the Air France flight that crashed mid Atlantic. Idle speculation, but can that sort of thing happen on modern ships?