The title of this post is identical to the title of an article by Tiffany O’Callaghan in the Features section of the 1 Apr 2017 New Scientist. This article notes there are hardcore relativist philosophers who argue that there’s no such thing as objective truth that exists outside our minds. This is absurd. What they might be intending to mean, and is something that HM thinks, is that we shall never find objective truth (see the immediately preceding post that follows this one, blog style). Science is a systematic method for achieving an increasingly better understanding of objective truth. The risk in believing that one has objective truth is the same as having beliefs having certainty. They blind us to other better options.
Very often in both science and math, simplifying assumptions are made to make the research problem tractable. These simplifying assumptions are necessary and bring us closer to objective truth. However, it must always be remembered that these results were obtained using simplifying assumptions.
Unfortunately, we live in a world in which there are businesses devoted to making lies (see the healthy memory blog post, “Lies, Inc.”).
Steve Sloman says that as individuals, we hardly know anything. “But most of us do very well, and as a society we create incredible things. We sent a person to the moon. How is this possible”? Because of the knowledge of other people.”
The article presents the following advice for treading the fine line between healthy skepticism and destructive cynicism. “First, think critically and assess the credentials, track record and potential bias of the sources we rely on.” wrote Peter van Inwagen. He continues, “If someone is telling me this, what motives could that person have for wanting me to believe that, other than that it’s true?”
We should ask how do we know? How do they know? We need to ask ourselves whether our reaction to new knowledge is rooted in something trustworthy or something else, like wishful thinking. Those not believing in global warming in spite of scientific evidence might require them to do a certain amount of rather inconvenient stuff, stuff that would have financial costs, so they really rather not believe and start to make the sacrifices we would all have to make.
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