Something like radical acceptance from dbt is my go to for someone with your argument. I can acknowledge injustice and also acknowledge that much of it is out of my control. I can work towards correcting injustice whenever possible but I also have to recognize that fixing everything is far beyond me. For my own mental health I need to be able to recognize when I am ruminating on an issue that cannot be fixed and learn to let go of that attachment to suffering
Alternatively I can be miserable, forever dwelling on injustices that I cannot fix myself. But how does that help change anything? Really would argue it’s just giving the fascist party what they want. If “the resistance” is beaten and broken simply by business as usual then is that not great for them?
In a non political context think of an emergency veterinarian or ER doctor who got into the field because they truly care for animals/people. They undoubtedly will deal with unfair death, seeing the results of abuse, systemic failures about cost of care resulting in premature death or disability, etc. probably on a near daily basis if they live anywhere with people. Should they simply resign themselves to misery because of this cruel and harsh reality? Or should they find a way to let go of the attachments to the misery involved in these tasks so they can do their (very necessary) job that already desperately needs more of people like them