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"Well, of course chimps must be able to learn language"
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is because you might be caught in the grips of some bad ideas about language.
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So, one idea is you might say,
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"Look. Chimps should use language because chimps are so smart."
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But the response to this is,
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"They are smart but we know that smart isn't enough."
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We know that the human capacity for language
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is not totally a result of smartness.
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There are smart children who,
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due to some deficit in their language capacity,
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don't speak or understand a language.
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So, the smartness of chimpanzees does not in itself demonstrate