And like I said before it’s more likely that he would tell his close friends and his students at the academy then telling the entire galaxy. Also seeing as how the Galaxy can’t decide who Han Solo is there’s no saying as to whether the entirety of the galaxy in it’s totality would accept Luke’s news.
The galaxy’s opinion isn’t the subject; the subject is whether or not Luke would have shared the good news of Vader’s redemption with his nephew Ben Solo (Kylo Ren).
EDIT:
Also maybe Kylo Ren is in denial over Vader turning to good. I remember bringing that up too.
At some point Ben Solo was good, yes? Otherwise Luke would have felt Ben was evil and not attempted to train him as a Jedi. So I think it’s safe to assume that before Ben became Ren he was a good, or mostly good person…yes? And then at some point, as Leia said in the movie, Snoke turned him to the Dark Side.
OK PAUSE RIGHT THERE! At this point…at this juncture…as Ben is transitioning to Ren, WHY WOULDN’T ANAKIN’S GHOST APPEAR TO BEN TO TALK HIM OUT OF IT?!
There are only two answers to this question: He did or he didn’t.
If he DID, then why is Ren “praying” to Vader’s helmet?
If he did NOT, WHY NOT?! Did Anakin lose the power to appear as a Force Ghost?!