A single, simple question in response to this question:

**What problem(s) is a Code of Conduct intended to solve?**

Is the problem "new users don't read the Help Centre and therefore don't know about Be Nice"? Because... if they can't be arsed to read the short-and-sweet policy, do you really think they're going to read the much longer Code of Conduct?

If the problem is "someone got moderated and complained about it because they allegedly don't understand why, and the current Help Centre documentation isn't thorough enough to give an adequate explanation" then fair enough, a more comprehensive document than Be Nice will probably be helpful. Unfortunately, it's been my past experience that most people who choose to challenge administrative decisions do so not because they believe a mistake or bad judgement call was made, but because they are bad actors who either get their kicks out of wasting others' time, or honestly believe they are in the right despite any and all evidence to the contrary; self-entitlement seems to be a helluva drug.

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As for the new CoC itself, I have a fundamental objection to it on the grounds that I feel its language is too restrictive and open to abuse by bad actors; but if (as it appears) it's already been decided that it shall be imposed, then I have the following comments:

* Keep the original/legacy Be Nice mission statement as the very first item in the new CoC, with a blurb before and after that gives context. Something like:

> Our Code of Conduct can be summed up by the following statement:

>> **Be nice.**

>> Treat others with the same respect you'd want them to treat you. We're all here to learn together. Be tolerant of others who may not know everything you know. Bring your sense of humor.

> The above can be ambiguous, so in order to clear up any misinterpretations we've outlined fuller guidelines below.

> <rest of CoC follows>

* @Kobi's answer re "Our mission" is spot-on, I won't bother repeating what he's said here, except to concur.

* "Our expectations" section: move the "If you’re here to get help..." bullet point to the top of the list (same for the abridged versions) - IMO the CoC is primarily aimed at new users, so let's put them front and centre.

* "If you’re here to get help...": as @fbueckert noted, add something about demonstrating effort.