"Since this rule is perforce general, we will attempt to correct the problem by warning the violator (via PM, email, or posting in the thread), giving a chance to explain. We will take further action only if proven necessary."

The above construction suggests that the offending pronoun may not be needed for clarity.

(By the way, I can't find either the "introductions" area or the list of the other 13 rules, so I pretended I had read them, hoping they were typical.)