I consider Gojira not a Kaiju move because of it's strong anti-nuclear weapons message and in the same category as Silent Running and 2001.
Well, that doesn't make a lot of sense. A number of Godzilla movies have anti-nuclear or environmental messages. GMK
in particular is a powerful anti-war statement. True, none of the later movies are quite as potent or harrowing as the original, but many try to be somewhat in the same vein.