But... we had those on reddit. I didn't see many actual examples of the "moderator gone power crazy" stereotype that is so often echoed there (especially by people who fully deserved the moderator action they received).
The issue wasn't that the rules were clear. The issue was that people refused to read them in the first place, and became hyper-defensive and obstinate whenever they were called out on it, even by moderators.
Honestly - don't. Not unless you intend to be their 24/7 tech support...