Let's not sugar coat this. The advertising group told a judge that they felt it necessary to have a $3 million insurance policy to protect themselves against angry Christians. That's how much Christian violence and vandalism are impacting American life on a daily basis.
To be fair, we cannot be sure that this was the "real reason" the company denied the ads. Even so, it's compelling that they and their lawyers decided that their most believable claim was that they were afraid of Christian vandalism.
http://www.examiner.com/atheism-in-atlanta/arkansas-atheist-bus-ads...