Watch the last 5 seasons of DS9. It was actually the conservative star trek.
Yes, it was. The Federation against the “Evil Empire”. Frankly, DS9 gets a raw deal, it was (to me) the best Star Trek.
Kirk: There's just one thing I want.
Spock: The Klingon?
Kirk: One of us must get him.
Spock: Revenge, Captain?
Kirk: Why not?
Or how about this exchange from The Conscience of the King, where Captain Kirk reacts to Kodos' attempt at moral relativism:
Kodos: Captain Kirk, who are you to say what harm was done?
Kirk: Who do I have to be?
Or how about this very nice summary of what's wrong with the leftist idea that war should be "proportional" and fair and thus rational (consider this quote in the context of Gaza) from A Taste of Armageddon:
Kirk: Death, destruction, disease, horror... that's what war is all about, Anan. That's what makes it a thing to be avoided. You've made it neat and painless. So neat and painless, you've had no reason to stop it. And you've had it for 500 years.
I can go on. Basically, those characters had conservative attitudes toward right and wrong that just don't exist in curren television characters except in parody.