But that's the strange thing, Earth ISN'T a dystopia in Star Trek, it's the exact opposite.  In fact, it was sort of a running joke in the show that people from Earth are boring cause they don't have war, famine, starving people, uneducated or sick people. racism, or even proper prisons.  I will grant you that before that things really went into the sh*tter, but Trek's the rare SF series that said humanity basically decided they had enough of that and pulled themselves out of a rut and fixed all their own problems.