And let's not forget that even Layzner, a series coveted by western fans for being a "serious" mecha show, goes from being a fairly somber story of children trying to escape from an unstoppable threat to being like one of those Italian Mad Max knock-off post apocalyptic movies. Complete with ax-wielding thugs wearing giant wigs and hockey masks like Lord Humongous. And that's before the show gets into ancient alien space magic.
And sure, Macross blasted the Earth, but Gundam killed off half the human population in its opening narration. Space Battleship Yamato opened with the planet being