English is not the offical language of the USA. Therefore, No one is obligated to learn specifically English only. Furthermore, sign language is the native language of the deaf, so forcing a deaf person to learn English can be a bit insultive. The only reason a deaf person should learn written and spoken English is to have an advantage in the hearing world, academia, or they feel they cannot get by without knowing English.
Any foreigner, deaf or not, who lives in the USA, should know English. Anywhere you go, you see things in English. I'd say English is the most popular or common language. If you go to any college, they would expect you to write in English. There are no justifications for not learning English. It's funny you call it "forcing" when it's absolutely beneficial for a deaf person (or any person).