What is the main issue with the argument that left-handedness indicates a lack of willpower?

The argument that left-handedness indicates a lack of willpower is problematic primarily because it simplifies the complexities of human behavior into a single trait or characteristic. Human behavior is influenced by a multitude of factors including genetics, environment, cultural background, and personal experiences. By attributing willpower solely to handedness, the argument neglects these other significant influences, thereby failing to provide a comprehensive understanding of the relationship between handedness and human traits. This oversimplification can lead to misguided conclusions and stereotypes, which may not hold true for the diverse population of left-handed individuals. The richness of human psychology cannot be captured by such a narrow perspective, making this a fundamental issue in the argument.