Not sure how the radar and watches are handled now,but back when I was sailing(1966-69,your watch was using binoculars and keeping your eyes peeled. Radar is only so good,and a pair of keen eyes are needed. The one that happened before this latest one,it was said the merchant ship signaled the Destroyer,but got NO reply,so it seems that the watches and the wheelhouse were not paying attention. That is dereliction of duty ,and a serious thing to be brought up on charges for,with the several deaths,it could become manslaughter,or worse.
As RRR mentioned,it reflects a bad training and discipline issue. In WW2,if you screwed up,the ship might go down,and then YOU might be shark bait. Its a big ocean out there.