You would probably enjoy the original Godzilla movie—the one that they cut up to make the Raymond Burr version.
The movie is an analogy for WWII and the dropping of the bomb on Japan.
They debate whether it is morally right to use the ultimate weapon (a bomb that removes oxygen from the ocean, and thus devastates it) to eliminate an external threat (Godzilla).
https://en.wikipedia.org/wiki/Godzilla_%281954_film%29
I also liked Gorgo. The story was a lot like Kong, as they find a giant creature and bring it back to exhibit it. But the twist that the monster is just a toddler and its much more gigantic mother comes to take it home was hilarious.