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I once suggested that a science fiction book review probably didn't belong under the tag science. The contributor basically told me I was narrow-minded!

I don't see anything wrong with asking users to use more relevant tags.

Science fiction is still connected to science, in some ways, although I would have probably asked the same (the tags are at the end of the day there to help people finding what is interesting for them). But they are much worse cases where users feel the needs to fill all 5 tags with something even if not relevant ^^