Question: Why is 'zero' plural? For example, "there are 0 comments" not "there is 0 comment."

Answer: Zero is neither plural nor singular. It expresses nullity (Hence, it is not singular because it's not 1; Nor it is plural since it's not at least 2). Saying "There are 0 comments" or "There is 0 comment" are both syntactically correct. In both sentences, 0 (zero) is just a qualifier of comment/comments, specifically as an adjective.
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