IIRC, Paul Watson was a part of Greenpeace during its inception. His hardline stance and 'get out there into their faces' approach by intercepting whaling ships was not supported by Greenpeace so thus came about Sea Shepherd. Greenpeace probably operates in the way he says they do - informing the public with brochures, petititions rather than physical action which is what Sea Shepherd thrives on. Taking physical action has legal implications so Greenpeace has distanced themselves from Sea Shepherd. In a way, it's a bad approach to be breaking laws in the middle of the ocean combating whaling ships e.g. jumping on board anothers vessel, spray painting, tear gas, water guns etc. but a lot of people prefer this hardline approach so thus, donate to Sea Shepherd. Watson obviously feels hard done by Greenpeace taking all the credit when it is him and his ships out there taking all the physical and legal risks. Another interesting point Watson brings up is the whaling of other nations such as Norway and Iceland. To give an estimate, Norway hunt over 500 Minke whales a year, maybe one of these groups could do something about that too.