If you think capitalism didn't create and still heavily relies on racism, sexism, ableism, cisheteronormativity and so on (and no, comparing real life oppressed groups to fictional characters doesn't help) to literally exist, you've not been paying any attention.

Fighting only a class war still leaves an imperialist white supremacist cisheteronormative ableist theistic patriarchy.

Intersectionality is the only way everyone gets justice and equity.