Post modernism posits that there is no truth, nothing reliable, traditional science and traditions in general are just “constructs” promoted to the advantage of the oppressor class.
Post modernist thinkers view the world through a Marxist/Hegelian prism–and it makes them evil sorcerers.
However,the post modernists long ago took over much of academia and imposed this nonsense.
Here is a fine essay by a fine man, Classicist, essayist, military historian of great repute and scholarship, Victor Davis Hanson.
See if he helps you understand why we deal with so many things that aren’t so.
I teach ethics to physicians, and I try to include a little about how post modernism poisons the intellectual environment, but most physicians, including even academic physicians are not aware of what post modernism has done to scientific and academic inquiry.
Few except the political science and philosophy people know about post modernist theory (crit theory is another name) and how it has spawned a culture of politically motivated junk science, not just in the social sciences, but when considered important, in the usually more scientifically sound, harder sciences. Politics, ideology should not drive intellectual inquiry, but they do.