Somewhere I read and article how long on average a car can stay parked in a highway break-down lane before it is struck. It depends on the distance away from the travel lane, It’s non-linear of course, double the distance and the time between strikes increases greatly.
Same here, it was a bad place to anchor. In heavy traffic it’s just a matter of time.
The other factor is mate on the ferry. Moral issues aside, 50% of mates are below average. In this case the mate was over due for relief, he might have already mentally checked out.
I have zero interest in making excuses for anyone, just by probability, if you don’t want to get hit don’t anchor in traffic, if you don’t want your ship to t-bone someone send the mates home on time. No guarantee of course, just playing the odds.