Another example of Christians asserting their right to express their faith symbolically is discussed over at the Bad Astronomer's blog.
To summarise, a church has erected a brightly-lit cross on a hilltop not far from Mount Palomar observatory, breaking several local ordinances in the process. They defend their right to do this using the First Amendment to the US constitution.
Once again, I think that their determination to stand up for their faith on principle is overriding natural logic here: surely they can find a way to display their faith in a positive way, without contributing unecessarily to light pollution in a sensitive area?
As His Dagginess commented to me the other day, atheists are the only really tolerant people in the world, because there's no imperative for evangelism.