I know they are a private company and could probably block anything they want, but I'm offended that they are blocking politically controversial sites based on content. I think they just be neutral. If they block the NRA's website, they should the Brady Foundation's website. If they block Planned Parenthood, then they should block Right to Life.
This reminds me of Dubai. (VOIP sites are blocked because they are contrary to Islamic values). I understand why they might be concerned the crooks could hide behind anonymous ip connections, but their list seems to be paternalistic rather than driven by security.