Simple.
JJ Abrams never liked or watched Star Trek, by his own admission. He set out to reboot a series and make it his own, to do whatever he wanted and take the series in a new direction. By rebooting it, he essentially said that the entire TOS, TNG, DS9, Voyager (I can live with that one) never happened and just took a big steaming dump on them. Then he made completely nonsensical decisions involving plot development and just really bad writing to invent a character "Nero" that was just not entertaining. A character that had the ability to travel in time before his planet was destroyed and used it to not stop his world from being destroyed, but to destroy other planets. Talk about pathetically huge plot holes. You could have driven the Nar'ada through it. Sideways. Well we had a character, Jim T Kirk, who went from being an educated, strong man to being a whiney loser criminal drop out who got pulled into Starfleet (talk about low standards) and then got kicked out because he was being the jerk that Abrams turned Kirk into. Then, miraculously, he somehow gets involved with Starfleet again and saves Earth. Now, at that point, you put him back in Starfleet Academy. No, because Abrams is a moron, he had the wash out Starfleet cadet instantly promoted to Captain. NO ORGANIZATION WOULD EVER WORK LIKE THAT. That's the end of the first movie. Second one, the wash out cadet who should have never been a Captain, gets demoted and sent back to the Academy. Five minutes later he's a Captain again. Really. Like 5 minutes later. I thought they learned their lesson, but in the entire organization of Starfleet, apparently no one else has any experience or skills that would have made him or her a superior choice for being Captain. All through the entire development of this second tragedy, Abrams INSISTED that this new character wasn't Khan. He swore up and down he wasn't Khan. Half way through the movie, you find out he's Khan. Abrams, who had made every effort to make Star Trek new and his own thing, just ended up stealing bits of better written and better developed movies and TV shows and just demonstrated what an intolerable hack he was. He should never, ever, again work in someone else's stuff. Let him make his own things, but don't let him touch any established series.
And then we're getting Star Wars from this guy. *sigh*