And I bet they got yanked off the shelf as soon as they were found, too!
Does your Parks Department let people come in and plant things at random because they think the park "needs something"?
If your library needed Rush Limbaugh on the shelf because it had none, you could appeal to the librarian or the library board and cite their collection development policy. The goal is a balanced collection.
The kind of collection development you're suggesting is the kind in which the local extremist group (name your flavor) comes in and donates 85 items of their literature, which must be accepted because it's "free".
Regards--
Mary Anne