Libraries serve everyone. The importance of having the broad range of information and ideas available is that it enables us to be a nation of self-governors. But this form of government does not function effectively unless its electorate is enlightened. The electorate must have information available and accessible. But the format in which information is found doesn't change our role of bringing people together with information they need or want.
Filters are mechanical devises unable to think or make judgements.
The result is that valuable, useful, and legal information inevitably is blocked. Persons with names such as Couples and Babcock have been blocked. The filter manufacturers consider their black lists proprietary information and most, therefore, will not reveal what they block or how. Even the filtering manufacturers admit it is impossible to block all undesirable material. The Web is too vast and changes too quickly for filters to be effective.