I find myself shaking my head in disbelief when I come across people who write off Catholic teaching with some variant of “that’s just your opinion.” I shake my head because rationally that means we can write off their views of right and wrong on the same grounds. If one rejects a Christian’s arguments on these grounds, one can reject the arguments of an atheist on the same grounds. Under those assumptions, we can’t find truth about anything and we can only use legal or physical force to compel anyone to accept something. It’s ironic that people who claim to champion reason and enlightenment should promote a throwback to “Do what I say or I will bash you with my club!”
It’s not surprising that people believe this tripe. I recall a teacher in High School once give us a couplet: “Opinions are never right or wrong. Opinions are only weak or strong.“ The couplet confuses “opinion” with “preference” or “feeling,” leading to people thinking that a religious view on abortion is no different than a preference for a flavor of ice cream. Many dictionaries give that interpretation to opinion as well. But that is only one of the meanings.
An opinion on matters of right and wrong, as Merriam-Webster describes it, “implies a conclusion thought out yet open to dispute.” This means that the value of the opinion depends on how it matches reality.