Our children deserve a consistent intellectual foundation. Facts are things that are true. Opinions are things we believe. Some of our beliefs are true. Others are not. Some of our beliefs are backed by evidence. Others are not. Value claims are like any other claims: either true or false, evidenced or not. The hard work lies not in recognizing that at least some moral claims are true but in carefully thinking through our evidence for which of the many competing moral claims is correct. That’s a hard thing to do. But we can’t sidestep the responsibilities that come with being human just because it’s hard.

What would you say if you found out that our public schools were teaching children that it is not true that it’s wrong to kill people for fun or cheat on tests? Would you be surprised?

I was. As a philosopher, I already knew that many college-aged students don’t believe in moral facts. While there are no national surveys quantifying this phenomenon, philosophy professors with whom I have spoken suggest that the overwhelming majority of college freshman in their classrooms view moral claims as mere opinions that are not true or are true only relative to a culture.

What I didn’t know was where this attitude came from. Given the presence of moral relativism in some academic circles, some people might naturally assume that philosophers themselves are to blame. But they aren’t. There are historical examples of philosophers who endorse a kind of moral relativism, dating back at least to Protagoras who declared that “man is the measure of all things,” and several who deny that there are any moral facts whatsoever. But such creatures are rare. Besides, if students are already showing up to college with this view of morality, it’s very unlikely that it’s the result of what professional philosophers are teaching. So where is the view coming from?

A few weeks ago, I learned that students are exposed to this sort of thinking well before crossing the threshold of higher education. When I went to visit my son’s second grade open house, I found a troubling pair of signs hanging over the bulletin board. They read:

Fact: Something that is true about a subject and can be tested or proven.

Opinion: What someone thinks, feels, or believes.

Hoping that this set of definitions was a one-off mistake, I went home and Googled “fact vs. opinion.” The definitions I found online were substantially the same as the one in my son’s classroom. As it turns out, the Common Core standards used by a majority of K-12 programs in the country require that students be able to “distinguish among fact, opinion, and reasoned judgment in a text.” And the Common Core institute provides a helpful page full of links to definitions, lesson plans and quizzes to ensure that students can tell the difference between facts and opinions.

So what’s wrong with this distinction and how does it undermine the view that there are objective moral facts?

First, the definition of a fact waffles between truth and proof — two obviously different features. Things can be true even if no one can prove them. For example, it could be true that there is life elsewhere in the universe even though no one can prove it. Conversely, many of the things we once “proved” turned out to be false. For example, many people once thought that the earth was flat. It’s a mistake to confuse truth (a feature of the world) with proof (a feature of our mental lives). Furthermore, if proof is required for facts, then facts become person-relative. Something might be a fact for me if I can prove it but not a fact for you if you can’t. In that case, E=MC² is a fact for a physicist but not for me.

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