Mind-Control Griefing: Working as Intended?

I noticed this post on the EU forums regarding massive lost of Cenarion Circle reputation after accidentally attacking a flight master who had been mind controlled by the opposing faction. You know how you right click on a flight master to talk to them and fly somewhere? Well, right clicking will also enable auto-attack on a hostile target. So if the mind control is timed just right, you may not even realize what happened - the flight path window never came up, and you just lost 15000 reputation. (Note: in this case, the initial auto-attack tagged the flightmaster to the player, and opposing faction player killed it - thus the massive reputation loss.)
However, GM response simply stated that this was "designed this way" and a CM response states that this is a GM issue. So is it really intentional for other players to be able to cause you to loose huge chunks of reputation like this (it's -15000 for killing a member of faction), through no fault of your own? It seems rather wrong to me, but in the mean-time I'm going to be very careful when flying out of Cenarion Hold...