I am a lawyer and post here and other places. I don't add a big disclaimer, but I usually indicate that I am not taking this case, not licensed in their state, or something to that effect. Just chiming in here to say that this is a crazy legal area. A lot of areas of the law are VERY fact dependent. However, they usually resolve down to a handful, up to a dozen standard scenarios.
The possibilities here are near endless. See for example any discussion on the colregs (right of way vs stand on, anyone, anyone. ) or think about the possibilities with just two boats each with a solo occupant (sail and sail, sail and motor, sail and fishing, anchor and under way, ...). Add in more boats, more people, ... It's a law professors dream for exam material.
Only once you have narrowed down all of these facts can you begin to select the law. In the majority of legal areas you have either state or federal law and in some cases you have a choice. In fewer instances you have a mix. Here, you have state, federal, maritime, and international as possible bodies of law. Not to mention there is both statutory law and judge made law in most of these areas. Maritime law is also one of those areas that has a long, rich, and sometimes archaic precedent.
Net, in most posts there is not enough detail to ferret out the major facts to even begin researching which law applies.
Since this post is already quite long, I'll conclude by saying that people in positions of power and authority throughout mankind's history have abused that power for both their and their friends benefit. Doesn't mean the system or the law us bad, just means there are bad people. Also doesn't mean we should quit calling out the bad people or working to make the system better.