Oh bugger, I've just realised...
Nothing to butterfly away Godzilla has occurred, if anything, it was intensified.
Monty Python do the sketch about mutant fish taking over Berlin, complete with Graham Chapman as a German General telling everyone to stop that, that's silly, going on a rant about how there's no such thing as mutant fish that could take over Berlin, if there were he would know about it because the military always know about such things, then telling the sketch to carry on but stop being silly just before he is eaten by a giant animated mutant fish, and the next thing you know, Tokyo is stomped flat by a giant conga eel, (no, I have no idea how a fish with no feet can stomp a city), only to be driven off by the toxic fire breath of Godzilla.
It's the 70's. These things happen.