The BSA practices religious discrimination. They exclude atheists and agnostics, and also Unitarians because of the Unitarian position on gay rights. As a private organization, that is their right. They advertize it. They're proud of it. Whatever. But they have no right to use government money, or property, for activities from which they deliberately and systematically exclude some citizens solely on religious grounds. Constitutionally, they are no different from any other group in this regard.

Why is this so hard to understand? If it were another organization using government money, or property, for activities from which they deliberately and systematically excluded Christians, it would be easy to understand, wouldn't it? And you know what? The ACLU would fight that too. It's the principle.

If the BSA wants the world to think that the ALCU is full of bad people because the ACLU doesn't ignore people the BSA doesn't like, that's the BSA's problem.