Probably a rather geeky thing to say but Star Trek TNG promoted honesty, morality and a strong sense of ethics to me. That IMHO is no different to classic moral stories as the basic premise is the same in some episodes.
It's a bit like the TNG ethics are being used as an ethical framework to bounce modern issues off of and continue the cause of sci-fi as social commentary, but in a sense the commentary is the upright TNG style morals and how desperate circumstances might make it difficult to uphold those values.