If a giant Godzilla or King Kong sized creature became a real thing, it wouldn't be much of a threat because the military would have more than enough firepower to kill it easily
This is the shit I think about at 4am when I'm awake
Why focus on firepower? Locks you in to an arms race for density, basically - who can field more mass/energy (menergy? 🤔).
The Sword In The Stone taught me very young that if you've got to fight something big, you can go big, or you can go very very small. More likely we'd beat it with a biological or chemical weapon.