Oh that is just a little pet theory of mine. I think that the Others greeted the Lostaways as a threat because they WERE a threat. There were people on the plane who were planted there by the Baddies and they were actually a threat to the Island. I think we will see that the Others actually are the good guys and we will end up very sympathetic to their cause. So if Ethan and Goodwin were good guys, we will find out that the two random deaths they caused were bad people.