It's present subjunctive, and we use "be" to mean something could be any of these: feelings, thoughts, or emotions. By using "is", we confirm them as realities, when it's simply not the case.
May 26, 2015
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By the way, "it" is only used in place of a noun in English. You could say "Why is it used instead..." or "Why is "it be" used instead...", but you can't say both.
May 26, 2015
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