Because English and sign languages are completely different and deaf people regard English as a foreign language. If you’ve ever seen a comment written by a deaf person it tends to be grammatically incorrect or awkwardly written but the spelling tends to be impeccable because they learned the language through reading. Lots of deaf people are not fluent in English the way that hearing people are. So translators are used because that’s still the best way to communicate a message to a deaf viewer.
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