Self-protection mechanism: Parents may be reluctant to admit that they have done you harm, because it may pose a threat to their self-image. People sometimes take self-protection measures to avoid facing their own mistakes or faults.
Cultural concept: In some cultures, respect and filial piety for parents are regarded as the supreme responsibility. In this cultural background, it may be difficult for parents to accept that they may cause harm to their children, because it may be regarded as disrespect.
Lack of self-awareness: Some people may lack enough self-awareness and realize that their actions have caused harm to others. They may not be sensitive enough, or they may lack enough emotional wisdom.
Indulge in your own predicament: Sometimes, parents themselves may face many difficulties and pressures, and it is difficult to face up to the impact of their actions on their children. They may be addicted to their own problems and unaware of other people's feelings.
Emotional defense: Some people may have an emotional defense mechanism, and they may not be able to face their mistakes because it may cause them deep pain and shame.
Dealing with this situation may take time, patience and open communication. I suggest you express your feelings with respect and understanding as much as possible, and you can also consider seeking psychological counseling or family counseling to promote healthier communication and understanding. But please remember that dealing with family problems is usually a complicated and long-term process.