I realize that parents usually help children choose books from my front yard, and that I do not have an obligation to leave specific books in my L.F.L. indefinitely. Still, these anti-science books present me with an ethical dilemma: If I am opposed to schools’ and public libraries’ banning books like ‘‘In the Night Kitchen,’’ ‘‘Fun Home’’ and ‘‘Heather Has Two Mommies,’’ must I also distribute creationist children’s books? — Name Withheld