...And so is love, but that's another trope. Louis Armstrong once had a song by the title of "What a Wonderful World". Which is pretty much the opposite of what it's like when Earth Is a Battlefield. That's because when Earth is subject to this trope, it's hard to find anywhere on the planet where there isn't violent fighting going on. Anywhere you do find that's peaceful now could easily become thick with fighting at a moments notice, if it wasn't thick with fighting previously. Nobody on Earth is untouched by loss of loved ones. And making love instead of war isn't exactly an option for anyone who's serious about coming out of this ahead. If War Is Hell, then having this trope means the underworld's unleashed its evil upon the planet, and they're having one hell of a field day.