Mr. Doe said:
Star Trek (the original series) had one message and that was "Space is awesome!"
Are you sure about that? Maybe you need to rewatch some of the old episodes because from what I've seen every one had some kind of moral.
Pick one at random, A Taste of Armageddon [http://memory-alpha.org/wiki/A_Taste_of_Armageddon_(episode)], who's moral was a simple "war is fucked up no matter how you slice it" message.
But I got a question. Can you name a single film, outside the science fiction genre, that you consider good, that didn't have a message of some sort?