Traditionally, if you think a scientific field is a bunch of nonsense, you have two options: a) ignore it, and, b) change it from within, by publishing better work yourself, etc.
But, to mobilise some kind of research police to tell other academics what to research and how to research it? I don't think so. Academics should be free to study whatever they like. If this ends up producing a load of garbage like gender studies, then so be it. They can study their irrelevant and useless subjects, so that I can study my all-important subject (AI; and I'm being sarcastic- of course my own field looks more important to me).
In any case, it's really not the job of STEM researchers, or any researchers, to police other fields. I don't see any sort of justification in what you describe.