I think that is a bit of a loaded question and one that is based on perspective. There are lots of studies that show the impact of people harvesting but you are correct, it is hard to track what is being harvested and from where hence the blanket bans on coral exports. In this case they are being accused with the actual planning of exporting illegal corals. Basically they knew what they were doing was illegal and still planning it anyways. The people in that article knew what they were doing was illegal, they arent tourists who thought it would be nice in their personal tanks.