The consistent application of rules is logical and moral. The inconsistent application of rules create exceptions to the rules, leading to contradictions and special pleading, which is the abdication of responsibly for one's own actions.
however
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Does this apply to all rules, including those that are illogical and immoral?
Rules can be faulty by design. We do not consider the thought experiment of the AI driven paperclip factory to be a moral application of a system that follows rules with perfect consistency.