It’s true that we evolved in response to an environment, but the actual genetic changes that allowed for that were not developed with purpose. They happened randomly, and the ones that happened to provide a benefit made those individuals more likely to have more kids that those with less beneficial random changes.
They don’t just want to choose not to think, because then they might have pangs of regret from making that choice. They want others to tell them that women aren’t allowed to think, so that it’s no longer their decision, and so it can’t be their fault if it’s a bad one.