Originally, the "siege" policy was motivated as the means to make the Gaza population unhappy with Hamas rule and induce them to overthrow it. It didn't work, and actually should not have been expected to work because historically, Arab masses do not overthrow rulers, Arab militaries do that, but in Gaza Hamas IS the military. The policy failed to achieve its goal, but was continued nevertheless under changing explanations (today it is the Shalit excuse). Only after the "flotilla" debacle is the policy changing. How much damage can a pointless, visibly failed policy cause?
Islamic State militants blow up ancient Arch of Triumph in Palmyra (Reuters)
from the article: Give them an inquiry