I have no stake in the Conception fires on either side, do not know the maritime law well enough to comment on them, and do not know any facts that you all don't. So, not gonna try to convince you one way or the other on how this thing will play out, or whether justice is being done.
That being said, old laws which are still on the books and still enforced is generally a sign that they are good laws, not a sign that they need to be changed. If they were bad, then by definition, there would have been many chances by now to stop enforcing them or remove them entirely. So, arguing that they need to be updated just because they have been around for awhile doesn't really make sense.
Are a lot of examples of laws laying around that are both old and bad? Yes, of course there are plenty of them. But that line of reasoning is unhelpful for understanding what happened on the Conception, unhelpful to those involved and their families, and absolutely unhelpful when trying to understand how the legal proceedings will play out.