I hope you report people for
Sleeping in a hotel room with someone of the opposite sex or
flying a kite in public or
sweeping dirt into the street, because rules exist for good reasons.
The anti-parser rule exists for one reason, and one reason only. It's been stated by YoshiP. FFXIV doesn't have damage parsers because ONE celebrity got harassed with low numbers ONE time years and years ago, and therefore parsers are evil and toxic and should never be allowed in the game.
So clearly, if someone's using one and not harassing anyone with it, that means it's EvilBadWrong and must be stopped. Because its existence is the problem.