Drak, i think i'm misunderstood here.
I do not claim that you moderated badly. On the contrary - I give you a 10/10 grade in moderation. honestly.

My point is that by default, any moderation rules = censorship.

Think of it this way- Just as the NSA and GHCQ claim they do not use or publish our personal content so we have nothing to be concerned about our privacy being breached, the mere fact that WE KNOW that they do sweep through everything we write/communicate makes us communicate differently, self-censor our content, and make it less genuine.
I don't think anyone should even consider if their content complies by the rules, or borderline, or any other self-censoring thought. If anyone has something to say- say it, and we will either read it, ignore it, reply, or ignore the user altogether.
That's part of my belief system, and it has NOTHING to do with you, or with this other rule, or with how superbly you moderated until now.
These are my 2cents, and now that i've posted my thoughts, i'm not going to touch the subject again and remain as before either way.