Post modernism has some blame, but I think more of it is that we don't have culture which allows post modernism to flourish. I was watching Joseph Campbell and the Power of Myth, and he was commenting on how myths and beliefs have to evolve as they are supposed to explain a certain time and place, and trying to cling to 2,000 year old myths from the middle east, stagnates our humanity. (He also has a great quote about being too focused on the identity and ignoring the material body causes a schizophrenic fracturing which rang familiar with the modern trans movement)

I had a similar thought reading Braiding Sweetgrass - I was struck at how white people have lost that cultural identity - the knowledge of plants and locations we're indigenous to. We've been stripped of our culture, too, but we don't talk about it because we're the dominant people who stripped it from others, so it's in poor taste to acknowledge that. We've replaced that void with pop culture, and it's shallowness and meaninglessness has to culminate in something like what current society is.