I think the drones are a good idea as long as they don't try to impose their brand of vigilante justice with the data that the drones gather by performing raids. In fact, if they sold the boat and used the money to go the extra mile and buy a drone with solar panels and a very high power camera, then they could constantly monitor the whalers. Using the drones, they would act as a Neighborhood Watch for the Antarctic Ocean, and alert the proper authorities when trouble arose. If help didn't come in time, then the photographic evidence would be good evidence for a lawsuit or later report. Though I agree that Sea Sheperd is putting themselves and others in danger, there is no reason that they can't watch and report wrongdoing (provided that they do it correctly).
-Penguin