Given what little I know about the incident I’d have to conclude that the crew of the USS Fitzgerald was negligent/incompetent/improperly trained. Or some combination of those. All boaters know that it’s the primary responsibility of the smaller, more maneuverable watercraft to avoid collisions on open water regardless of the circumstances that brought the larger, less maneuverable watercraft into close proximity.
The crew on the Fitz bridge blew it completely whether this was an attack or not.
Blew. It.