Residents conduct a search and rescue operation in the rubble of destroyed buildings after Israeli attacks at al-Nuseirat refugee camp in Deir al-Balah, Gaza on February 28. Ashraf Amra/Anadolu/Getty ImagesMore than 30,000 people have been killed in Gaza since Israel’s war with Hamas began in October, the health ministry in the besieged enclave said Thursday.The towering figure underscores a horrific, months-long ordeal for Palestinians in the territory, during which Israel’s bombing and ground campaigns have displaced the vast majority of the population and created a dire…