Why the Navy is walking back a homicide charge against the former McCain CO

This skipper is responsible for the state of his crew's training, Hazarding the vessel, and the deaths of several sailors.
He's done in the Navy.
As for punishment, it should be harsh to deter future instances, but homicide? I don't think so.

When a ship casts off the last mooring line that attaches his ship to the pier he is the ultimate authority. He is both Captain and Commander of his ship. His orders must be followed without question. While he can rely on his junior officers and can delegate authority to them. He he cannot delegate responsibility. He now must be willing to now accept responsibility for the collision and accept the punishment awarded.

My only question for these CO's would be, were you consciously aware of the contributing negligence that led to these deaths and if so what did you do to mitigate?

“The decision to try most of the cases in both collisions at Special Courts suggests a message that may be interpreted as the deaths of 17 sailors and half a billion dollars worth of damage only warrants a misdemeanor,” said Brennan.

While I believe this statement is 'over the top', it does shed light on the Navy's inability or unwillingness to convene a General Court-martial. Legal issues aside, this is not only a CO issue but a Navy issue and I pray the Navy's after-action goes far enough to prevent this from happening in the future.