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If you've always had perfect statistics of good reports then it means the system is working as it should. No system can be perfect or appease everyone at all times. The mods also do their best with what is available.
What annoys me the most is when you do something and it works, you do it again and it suddenly stops working. Why, because of what? Unknown, just because.
Human error. You factor it into anything that people act based on their discretion.
This error could be from the person handling the reports or the person making it.