From a Marxist perspective, UK, USA, France etc had the same class interests as Nazi Germany. They were also uncomfortably okay with the Nazis Pre-war. I know this is a big topic (and I’m sure some marxist books have been written on it) but briefly why did the Allies fight against Nazi Germany from a dialectical pov.
Because the US was strangling them with an oil and trade embargo. It was either go to war and try to prevail against the US in the pacific with a quick decisive victory, or slowly have their empire fall apart. It was an inter-imperialist conflict over who gets to colonize the pacific. The US won and took many of Japan’s former island colonies as their military bases with which they have since been trying to surround and contain China.
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That and I would also add in about the Philippines issue. The USA controlled the Philippines and not conquering it along with the rest of southeast Asia (which they invaded mostly for resources) would leave Japan’s shipping routes and Indo-Pacific colonies extremely vulnerable to a future attack by the USA, so they opted to strike first.