jbd:It is more common for people to not want to get involved these days. Over the years, there have been reports of beatings, rapes and assoults taking place with plenty of bystanders and no one helped the victim(s).
Not to mention legal issues -- not everywhere has a "Good Samaritan Law" to protect those helping from lawsuits. Those that do (and I think there is a federal law in Canada) seem to have a much higher incidence of good Samaritans.
jbd:Also, most people out on the water are not trained, or if trained not proficient in water rescue.
That's correct -- and most are also told that trying to help someone in the water (when it's beyond your training) is an easy way to make two victims out of one.
jbd:As far as I know there is no legal obligation for a lay person to initiate a rescue. Some people may feel a moral obligation to try but on the other hand some people may not feel that same moral obligation.
There is usually no legal obligation for the lay person. However, there is a often a legal obligation for those trained in rescue to perform it. For instance, if I was trained in some sort of First Aid (or First Responder), even if it is just Rescue Diver, and drive by an unattended accident scene on the highway without stopping, that can be considered a criminal act here (unless I can prove there was a threat to my own safety).
Depending on your view of universal morality, there could have been an obligation to help here -- if anyone was around to perform such assistance. I don't believe it has been established if there were any people other than the captain who would have been around and available to assist... and the captain likely had concerns about endangering more people if he attempted to assist.