I think the objection that myself and other leftists would offer, is that the fight is against fascism is fundamentally a fight against, white supremacist, capitalist, patriarchy, and that capitalism is in many ways a progenitor and protector of the other two. The wealth generated by capital, captures regulatory bodies, manipulates voters, generates disinformation, all in service of perpetuating itself. A notable example is in your own comment, the power of the capital used by the fossil fuel industries to influence elections, buy political power, misinform voters, because the base scientific reality is that their industry cannot function in a world that is inhabited by people.

So for fossil fuels and tangentially, billionaires, the global issues cannot be tackled without recognizing that the core of capitalism is itself a vital part of the building of fascism.

To re-frame this in hopes of giving insight, imagine we were talking about racial justice in America, and one party was arguing that with various other ways to fight inequality, the police as an institution, have fundamentally rotten, and end goal needs to be abolition. The other party argues that we need to come together and stop the right wing fascists like proud boys, et al, that support white supremacy. So when you say we need to come together and tackle the issues without dismantling the tools that are use to create them, it sounds hallow.