Why does Malala's father chose to stay in Pakistan and send her alone abroad for treatment?

Malala's father was unsure if he should accompany Malala to Birmingham or stay in Pakistan to take care of his wife and sons. If Malala goes alone, it would cause a big problem because she was a minor. Malala's mother asked her husband to stay, while Colonel Junaid, Dr. Javid and Dr. Fiona persuaded him to go abroad.