Several people have asked me why I spend so much time and energy on this column, which is read mainly (if not exclusively) by people who already share my views and values.

“Why are you preaching to the choir?” you ask. “Wouldn’t your efforts be more useful if you tried to convince people who aren’t already convinced?”

In my experience, people who have a deep emotional or intellectual investment in seeing the world one way are unlikely to change their minds by seeing or hearing someone who challenges that investment.

The people who need to be reached are those who remain reachable — whose minds are still open to evidence and argument.

Even if you already agree with me — even if you’re already in the “choir” — you still may benefit from two things I can offer.

The first are data, arguments, logic, and analyses.

My abiding hope is that the data, arguments, logic, and analyses in this letter help you make your case to others in the range of your voice — to friends, family members, and acquaintances whose minds are not closed, and who could be persuaded of the truth.

My faith is that there is no better way to spread the truth than one-on-one – among people who talk and listen directly to one another.

The second thing I wish is that these weekly columns give you confidence that you’re rational and not alone.

In today’s incendiary society, it’s sometimes hard to remain confident of one’s views. When many prominent people are telling lies, and when those lies are amplified and then repeated by people you know (perhaps even inside your own family), it can be challenging to remain sure of oneself.

I don’t mean to suggest that you should hold on to your views if they are contradicted by evidence, or that you should remain steadfast in the face of reasonable arguments to the contrary. In fact, I’ve often told my students that the best way to test their views is to talk with people who disagree.

My point is that at a time such as we’re in, “preaching to the choir” is not a waste of my time. I sometimes think it’s the most important thing I can do.