Okay, smartalecs, I mean the grungy old diseases had been eradicated, clearing space for shiny new sci fi diseases that are so much more charismatic and fun!TOS was never a sterile, disease-free zone. Why do you think they kept Dr. McCoy around?![]()

Nobody was dying of freaking smallpox or typhoid. About the only 20th C disease left was alcoholism (although I guess that goes in the charismatic category.) But at least cigarettes seem to have been outlawed and nobody is fat except for jovial space rogues.
Earth is the squeaky-clean utopia. Presumably it is not overrun flying fried eggs and giant space ameobas. It's only if you're foolish enough to venture out into space that you have to worry about such things. Ditto for war - Earth is peaceful but Starfleet is constantly getting into some sort of fracas. Presumably other major worlds of the Federation are also utopias since it seems very unfair for Earth to be the nicest place around.But I'm not sure where people got the idea that Trek was supposed to be this squeaky-clean, sterile utopia where everybody is perfect and nothing bad happens.
I'm gonna chalk that up to a misplaced word. Starfleet is the armada that keeps all the bad stuff at bay, and takes all the nasty risks, so the Federation can live its cushy, utopian existence.As far as war is concerned, the Federation in the alternate realm is a "peacekeeping armada" now, which it was not (or never refer to as) in the prime universe. Not Starfleet mind you, the Federation itself was an armada.