Why Solipsism Is Irrational: A Critical Rationalist Perspective

In a recent podcast episode, philosopher Kasra presents a compelling argument against solipsism from the standpoint of critical rationalism. Solipsism—the belief that only one's own mind is certain to exist—is often thought to be irrefutable. However, Kasra argues that it fails as a rational position because it cannot be critically tested or improved upon. Unlike scientific theories that can be subjected to falsification, solipsism offers no way to learn from error or to distinguish between better and worse explanations. The discussion draws on Karl Popper's philosophy to show that even if solipsism were true, it would be a useless hypothesis because it cannot guide action or inquiry. The episode suggests that embracing fallibilism and the possibility of error opens the door to genuine knowledge growth, making solipsism an intellectually sterile dead end.