It makes my blood boil to read this.
You are spot on when you opine that the news "professionals" were too busy trying to paint a lousy picture to do even the most basic research.
You would think that making slanderous statements like these would require at least basic collaboration from other verifiable sources, but...no.
If I were a Marine or ex-Marine, I would beat the tar out of this guy if I ever met him face to face for the slander he has perpetrated on his (no longer) fellow Marines.
Shunning would be best, but this guy is too far gone to be affected by shunning.
"I meant that's what my unit did," he said.
This son of a bitch had better pray that nobody from his unit catches up with him. I can't see members of Massey's former unit having a sense of humor about this.