Question

Why does the government force harrison bergeron to wear a red rubber ball on his nose

Answer 1

To cover his unfair attractiveness.

Answer 2

The government forced Barrison Nergeron to wear a red rubber ball on his nose in order to ensure his good looks were hidde. He had to cover his attractivenes by wearing also  a huge pair of earphones, thick glasses, and three hundred pounds of scrap metal. In addition to this, Barrison Nergeron  had to keep his eyebrows shaved, and cover any straight teeth with black caps.