Quite right, I don't believe T-Nation censors viewpoints. It censors the seriously inflammatory expression of those viewpoints when necessary.
Why? To allow discussion to thrive.
As much as we all want everything to be "free", it really doesn't work very well when there are no rules.
Things drop to the lowest common denominator -- which would probably mean that we couldn't get much by way or interesting informed conversation or even fitness knowledge without T-Nation exercising some type of editorial control.