I think you’re a little off on the “we need to fix this world” guys.
Although zombie films / TV series lean heavily into the action side of things, that’s just because it’s more entertaining than watching people building things, developing tech, doing scientific research.
Remember with COVID 19? Huge numbers of people immediately set out to find a cure, inventing and deploying ways to prevent and monitor the spread, creating pop-in treatment centres, etc.
I wish I had your confidence that capitalism can be tweaked into a fair system.
I honestly think the logical end point to capitalism is self-destructive extreme wealth disparity.