Thread:The Reptile King/@comment-27950421-20180623213612/@comment-27950421-20181126214240

He did in one continuity. In the Planet of Monsters series, he literally chased humanity off the planet, even after the human race was assisted by two seperate alien civilizations. The refugees eventually returned, but by the time they did, the earths environment had already adapted to Godzilla making even the atmosphere hostile to normal humans. Even then a group of humans still survived, likely under Mothras protection and eventually evolved further in order to survive the environment.

In the Godzilla in Hell comic series, Big G and Space G accidentally destroyed the earth in a climactic showdown, which is how Godzilla died so that he could even get to hell, you know after he told the armies of heaven to fuck off, eating a few angels on the way while he was in purgatory...

Beyond that, it is commonly assumed that Godzilla either can't wipe out humanity, doesn't care about humanities existence beyond when they provoke him, or has some need for humanity. I personally subscribe to a combination of the later two, given that he does feed on nuclear energy, and that's rather hard to come by without human intervention, and that beyond his outings to feed and when he's chasing down another kaiju, he tends to leave humans well enough alone. However given that Mothra and few other kaiju (mostly Mothra) act as guardians to humanity, it may very well be that Godzilla either sees it as that he wouldn't be able to defeat the combined might of the benevolent kaiju and the human race or he considers it to be more trouble than it's worth.

There's also the fact that while Godzilla is hella fast when he wants to he, it still takes several weeks or months to cross the Pacific so by the simple limitations of travel and human reproduction, he can't wipe out humanity even if he wanted to.