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I suppose it’s invalid in the context of showing you what you exactly searched for. But it’s pretty valid in the context of showing you what you’re looking for. For example, someone with a disdain for science when searching for the terms “big bang” or “evolution” is probably not looking for scientific articles detailing the rigor of the prevalent theories. If the point of a search engine is to find what you’re looking for, it’s pretty effective by that measure. It just so happens that what you’re looking is biased in its own ways.
Similarly, but from a good view, if a programmer searches “how to kill child” they probably don’t want a tutorial of how to kill human children.