It goes to running a motor vessel without seeing where it is going! This is an example where a person who was "disabled", was running a boat from a seated position, when he should have been standing, since he could not see ahead.
I have seen a number of vessels running on auto pilot where there was no one visible at the helm. Some have crashed--some got away with it. Also people driving while intoxicated or under the effect of legal or illegal drugs.
I guess the moral is that driving a boat is just as serious business as driving a car (or flying an airplane-driving a train etc).
My assessment of the video is that the folks in the boat would have either had very serious injury or have been killed, if they had not bailed out. As it is, there were injuries, and psychological issues to those in the boat....The moral there is be aware of what is happening around you even if anchored or fishing...