A Private Little War is a very pro-Vietnam intervention story, surprising given Roddenberry position on the war, of course he didn't write the episode.The first one that coms to mind for me is A PRIVATE LITTLE WAR, involving Kirk's necessary ''balance of power'' argument and including McCoy's sensible opposing views.
Masterpiece Society (TNG) carried a anti-abortion message from the character of LaForge. The ENT one where Trip became pregnant had some pro-life dialog as well.
