Topic on Talk:High Heel Face Turn
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In this case, it's something of a trope on it's own that is notable enough it got it's own trope.
In most typical good guy vs. villain media, if any of the villains have a high chance of defecting and they have high ratio of men to women, the less women are in the organization, the higher the chance is of them defecting to the good guys.
This is a quite common trope in comic books, anime, and quite a few cartoons, and it's specific enough, in my view, it stands on it's own as a trope in and of itself.