Essays / ethnic diversity essay- i need help with first paragraph [3]

Hey there:]
well I am working on an in-class essay and im not to sure how to start off my first paragraph. Have any ideas??
"Many people think that ethnic diversity contributes to the richness and variety of activities available to those living in and near the cities. others believe that serious problems arise when people from differnt cultures try to live together." Explain why you disaree that ethnic diversity "contributes to the richness and variety" of a given culture.