Answer: Because their handicaps keep them from maintaining focus on one idea.
In the story "Harrison Bergeron," people are forced to wear handicaps and masks in order to prevent them from being too beautiful, too intelligent, too talented or too athletic. This is because the government is trying to make everyone equal. When Hazel and George's son rebels on TV, he is killed by the government. Although the parents are watching, they are unable to show any emotion. This is because their handicaps prevent them from maintaining focus on one idea.