How is that every nation in the world is entitled to self defense against aggressive action (i.e. daily rockets into their sovereign territory, against their civilians) except Israel; the killing of this family was a terrible accident and unintentional. However, it would not have happened if the Palestinians, yet again, weren't seizing an opportunity to miss an opportunity in the form of the Gaza pullout, i.e. showing the world they are capable of peaceful co-existence. They are a terribly misguided people.
from the article: Peretz: Gaza beach blast may have internal Palestinian cause