Which is more epistemically rational?
Believing that which by lack of evidence could be false or disbelieving that which by insufficient evidence could be true?
“Epistemic rationality is part of rationality involving, achieving accurate beliefs about the world. It involves updating on receiving new evidence, mitigating cognitive biases, and examining why you believe what you believe.” Ref
To me the choice is to use the “Ethics of Belief” and thus the more rational approach one would be more motivated is to disbelieve, rather than “Believing that which by lack of evidence could be false”, otherwise you would accept any statement or claim as true no matter how at odds with other verified facts. The ethics of belief refers to a cluster of related issues that focus on standards of rational belief, intellectual excellence, and conscientious belief-formation as well as norms of some sort governing our habits of belief-formation, belief-maintenance, and belief-relinquishment. Contemporary discussions of the ethics of belief stem largely from a famous nineteenth-century exchange between the British mathematician and philosopher W. K. Clifford and the American philosopher William James. . In 1877 Clifford published an article titled “The Ethics of Belief” in a journal called Contemporary Review. There Clifford argued for a strict form of evidentialism that he summed up in a famous dictum: “It is wrong always, everywhere, and for anyone to believe anything on insufficient evidence.” As Clifford saw it, people have intellectual as well as moral duties, and both are extremely demanding. People who base their beliefs on wishful thinking, self-interest, blind faith, or other such unreliable grounds are not merely intellectually slovenly; they are immoral. Such bad intellectual habits harm both themselves and society. We sin grievously against our moral and intellectual duty when we form beliefs on insufficient evidence, or ignore or dismiss evidence that is relevant to our beliefs. 1, 2