There should be a deep mourning and concern over the death of objective truth, because with it comes the erosion of civility.
Objectivity pulls us beyond ourselves. The things that are beyond us are the things that save us from ourselves. When a culture, for example, decides that murder will not be tolerated, that assault is punishable or that theft is a crime, it puts the brakes on our selfish and impulsive emotions. Human nature, after all, has a dark side. You and I have probably both felt like punching someone or taking things that didn’t belong to us. Occasionally, we might even wish that someone we don’t like had a shortened life span. What keeps us from acting on our impulses other than self-control?
Objective truth. The idea that somehow murder, theft and violence are wrong.
Also saving us from ourselves is the knowledge that if we do something offensive to a widely embraced standard, we will suffer for it. A fine. Jail time. Social shunning. This is good, not just for us, but for our country. But the logical extension of a post-fact, post-truth world, is this: who says I’m right and you’re wrong? Who even said it happened? I didn’t. That’s just you saying I did. And you’re wrong.
For thousands of years, we humans have tried to keep ourselves from ourselves. Surprisingly, the Gospel has fueled much of that. Because when you die to yourself, something greater rises.