American after straffing a few times?

Yes,

The torpedo boats then closed in and strafed the ship's hull with their cannons and machine guns.[citation needed] According to some crewmen, the torpedo boats fired at damage control parties and sailors preparing life rafts for launch. (See disputed details below.) A life raft which floated from the ship was picked up by T-203 and found to bear US Navy markings. T-204 then circled Liberty, and Oren spotted the designation GTR-5, but saw no flag.[citation needed] It took until 3:30 pm to establish the ship's identity. Shortly before the Liberty's identity was confirmed, the Saratoga launched eight aircraft armed with conventional weapons towards Liberty. After the ship's identity was confirmed, the General Staff was notified and an apology was sent to naval attaché Castle. The aircraft approaching Liberty were recalled to the Saratoga.

You honestly think you have more authority than them to comment on it

My opinion is based on the investigations, and not on the opinion of a single individual.