I get the sense from your wording that you might be in the younger end of the spectrum. Although the world can feel pretty shitty and messed up, it’s often worth remembering “this too shall pass”. Obviously no one wants the world to be awful, and living through hard times isn’t desirable, but just like the good stuff never lasts, the bad stuff changes too. The Great Depression lasted a decade, the Nazis ran Germany for just a bit longer.
Those were presumably fucking dreadful times to live through. But the decades that followed were comparatively prosperous for the countries. What’s happening in the US is depressing as all hell, but it’ll change, and all you can do is the best you can to make it less dreadful, for yourself and the people around you.
I’m mot sure I understand what kind of answer you are looking for. What did the Whig historiography achieve? Or the Great Man theory? Isn’t Critical Theory an academic approach that allows people in the humanities a different theoretical framework to approach the problems of culture, history, literature, etc? It’s been pretty successful in that, and while I believe that academic scholarship has some influence on world affairs, it’s generally the political zetgeist exerts more pressure on academic thinking than the other way around…