Godzilla has gone from being a menace to humanity to being earth’s protector from other giant monsters who want to actively destroy the world.  

Originally, Godzilla is the menace that humanity needs to drive back into the ocean (even though we were the ones to wake him up/create him through our nuclear testing).  Eventually, as more giant monsters appeared, Godzilla became a somewhat benevolent protector, fighting the monsters and saving humanity.  

Sure, perhaps we see Godzilla as the lesser of two evils, but if you’re weighing the pros and cons of a world that you have to share with a giant monster, and being completely annihilated by a different one, I’m going to assert that you’ll learn to compromise pretty damn fast.