that sounds less like a backfire and more like a temporary reprieve because the groups that take these actions are better organized, funded, and with more members than the library's supporters can ever hope to match.
the examples they cite in the article happening across the country for this type of behavior proves that they usually win.
to add to this: it also takes perpetual acts of reaching out to people and educators to make them aware of reality and provide the means of education so that society doesn't get stuck into the headspace we're currently experiencing w the revival of the regressive and reactionary ideals.