I did a couple gigs at Borders Books when Captain Linda Greenlaw (see The Perfect Storm) was promoting her books, the Lobster Chronicles & the Hungry Ocean (both great books). I believe they (the store) or Linda wanted music that would go with the subject matter of the books.
There was money & there were contracts. The contracts were simple, only dealing with time, date, store & money, the allowing of selling your CD's while preforming & amount of time preforming. Nothing about staying away from any types of subjects or behavior etc. As far as I was concerned it was a cut & dry deal. At the first preformence I teamed up with Jerry Bryant, they bought some of his CD's to sell to boot. I believe there's a good bit of leeway locally given to the individual stores. That all said I think they should have told any tight assed commentators that the artist was contracted to preform & that as a store that premotes the printed word they could not turn 180% & premote the censorship of the spoken word.

You can contact them through their web site if you wish to complain (yes I did).

Barry