What assumption is made in claiming that immortality must exist to fulfill human desires?

The assumption made in claiming that immortality must exist to fulfill human desires is rooted in wishful thinking. This concept highlights the tendency to believe something is true or must be true simply because it aligns with our desires or hopes. In this context, the idea that immortality is necessary for fulfilling human desires suggests that humans yearn for eternal life, which leads to the belief that such an existence is not only possible but essential for a satisfying human experience. This reasoning can stem from an emotional or psychological need rather than from empirical evidence or logical reasoning, indicating a bias toward what is desirable rather than what is necessarily probable. This illustrates wishful thinking because it emphasizes the hope for immortality based on the desires of individuals, rather than assessing the reality of what is possible.