but godzilla didn't do anything

p.s They did explode his home, If somebody exploded your own house you'd be pretty mad

no what i mean is i have a theory that since humans exploded his home he decided to kill humanity, Remember last movie? "Good to know he's on our side" and the other guy said: "For now" Or something So he didn't decide with the human yet.

But if they had an ancient rivalry, That would mean kong wasn't born that time, Cause how would have kong gotten that big those many years ago?

That's actually pretty good theory. But maybe when kong was born, His parents used sign language to tell him about the ones who were bad, And killed their kind. Maybe kong didn't worry about it too much since Godzilla's kind didn't attack too much, But when they started attacking even more kong grew more hatred when he aged. The reason why he's always mad and doesn't want anything on his island.