Marvel Comics Universe, Lucasfilm and Star Wars #50 Spoilers follows.
The Betrayal Explained? How Did Darth Vader Line Up His Defeat Of The Rebels?
We know from Star Wars #50 (full spoilers here) that the Rebels were betrayed by Queen Trios. Well the back-up story in the issue explains why and it opens with a different Star Wars crawl then the opening story.
Darth Vader explains to Queen Trios that she ill become a valuable member of the Rebels only to eventually tur on them.
If she doesn’t, her planet will be destroyed like Alderaan was. She believes in the needs of the many outweigh the needs of the few and begins to kill members of her court that witnessed Vader make his offer…
…while Vader kills the rest.
Queen Trios is either a sadist or she is genuinely motivated by protecting her planet or somewhere in between both of these.