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I think a big reason why Genestealer Cultists sometimes fight back against a Tyranid invasion is simply to make the tabletop narrative flow a little better. Without it, there would be no narrative reason to have GSC vs. Tyranids. Except maybe the wrong fleet showed up to consume the planet, and even that seems pretty weak of a reason.

I like to have a quick narrative reason as to why each side is fighting each other before a game to give it some context. If all GSC gave themselves willing to Tyranids, it becomes practically impossible to conjure a reason for the battle. The tried and true training exercise for blue-on-blue doesn't even work well for this.