The British philosopher William Kingdon Clifford said “we should not believe anything except those propositions for which we have good evidence and that the confidence we place in our beliefs should be proportional to the amount of evidence that supports them.” According to Clifford we have a moral duty to engage in the hard work of looking at science, or our own good work in order to consult the best available evidence conscientiously and honestly before we commit to believing.
We have to be open-minded. That means that we have to be willing to accept evidence that contradicts our cherished beliefs or that contradicts those propositions we would really like to be true and we must be willing to discard or modify them if the evidence entails such actions. Only on that basis are we entitled to belief something. Only on that basis can a belief be ethical.
The fundamental basis for Clifford’s position is that the harm, the evil, the tyranny, the cruelty of humanity is a function of our superstitions, ignorance, and prejudices. As German philosopher Friedrich Nietzsche said, “we have to have not the courage of our convictions; we have to have the courage to attack our convictions.”
The basis of all superstition is that people believe things that are false and for which people have no good evidence. Some people say believing something without evidence is acceptable provided we don’t act on it. Clifford denies this. People often say that they live most of their lives based on rational evidence and if they choose from time to time to base their beliefs and their actions on horoscopes, or hunches, or perceived answers from God to our prayers, or perceived dictates from ancient sacred texts that is no one else’s business. We should be free to do that. Clifford disagrees.
Clifford says that if we believe a statement without evidence because we want to believe that, we are conditioning the mind to do that again. It will then tend to believe another statement without evidence just because we also want to believe it is true. This is really a kind of slippery slope argument. Credulity leads to ever more credulity. It is not possible to sequester such beliefs in order to avoid contamination. Contamination will follow inevitably from our acceptance of beliefs without evidence in one case. Our mind is so trained to think that this is acceptable.
Schafer gave an interesting example from his experience as an ethics consultant with hospitals. If you accept beliefs, such as religious beliefs, without evidence, you are more likely to believe that they should let their children die rather than giving them a needed blood transfusion. One irrational belief leads to another and that other belief may be seriously harmful. In fact, this is what we might be experiencing now with the explosion of anti-vax beliefs for which there is little or no evidence.
Another example that Schafer gave was the father of Turrel Dueck whose father was a fundamentalist Christian who believed that chemotherapy for the treatment of cancer was not appropriate. As a direct result of that irrational belief Turrel’s life was put in eminent danger. His father took him to Mexico for scientifically untested medicines that proved wholly useless. Irrational beliefs lead to more irrational beliefs. As a result of some irrational beliefs some have come to believe that homeopathy is a valid discipline, which Schafer said is total garbage.
Part of the problem is that people pass on their superstitions and their prejudices and irrational beliefs to their children. As a result, ordinary people in ordinary situations can infect others with their irrational beliefs. Irrational beliefs are never innocent. They often have seriously harmful consequences.
Schafer said “Clifford sees irrationality as a kind of infection.” The analogy Schafer employs is that of the person who knows she or he is infected with the aids virus having sex with an unprotected and unaware partner is committing a serious assault on that other person. So too with the person who relies on irrational beliefs. According to Schafer, “the penis or vagina in such circumstances can be a lethal weapon.” The same is exactly true of irrational beliefs that are accepted without evidence. The people who knowingly engage in unprotected sex without telling their partners of the risk are engaged in spreading infection and ought to be punished. It might be that the criminal justice system is not the best forum for this but the principle remains and is equally applicable to those who adopt irrational beliefs.
“There is no such thing as an innocent religious belief, if religion is irrational,” says Schafer. If it’s not rational it shouldn’t be believed.