What can become like personal property and be defended even if it can be proven irrational or wrong?

Beliefs and opinions can become like personal property, as individuals often cling to them fiercely, even in the face of evidence that contradicts them. This attachment can stem from identity, culture, or emotional investment, making it difficult for people to let go or change their views. Consequently, such beliefs can be defended vigorously, despite being irrational or wrong, due to their deep-rooted significance in a person's life.