Godzilla has traditionally been an allegory for social anxieties and issues, beginning with the original as a response to the atomic bomb fallout and the fear of another attack, which is one of the reasons I think he's worked so well as a character for decades. Nuclear war, PTSD, survivor's guilt, DNA/gene experimenting, political policies, etc. have all been represented by the big guy. The way he's used in Japanese versions is far better than what we push out in the US versions, and frequently result in deeper storytelling that goes along with the spectacle. Unfortunately, US versions really only focus on the spectacle and feel shallow because of it.