Why do people sometimes do not want to change their belief in a theory?

People may resist changing their beliefs in a theory due to cognitive biases, such as confirmation bias, which leads them to seek information that supports their existing views while dismissing contradictory evidence. Additionally, changing deeply held beliefs can create discomfort or a sense of loss, as it may challenge their identity or worldview. Social and cultural influences also play a role, as people often align their beliefs with those of their communities to maintain social cohesion.