Actually no, he hasn't. Star Trek (back when it was good) worked because the writers were smart enough to trust the viewers to draw their own conclusions. They would set up a dilemma, let the characters give arguments on both sides, and then not openly take a side. Even when you could guess which side the writers were on, it almost never felt like they were lecturing you like a child.

I am perfectly happy for science fiction to offer commentary on social issues. That's one of the strengths of the genre! But to do that, you need to be subtle and lots of modern authors don't even try to be subtle any more. And as a result, their attempts at social commentary are absolutely insufferable to sit through.