The principles of modern international law recognize the doctrine of blockade as a legitimate option between states in a declared state of war, giving them the right to apply naval power to stop all seaborne commerce with the enemy, including that carried in neutral ships.
Every last Jews and Israeli settlement was removed from Gaza in 2005 and it appeased no one, as Hamas rocket began to rain down on Israel within weeks. — Hence the walls and fences and legal weapons blockade. — Hamas has been very honest about their intention to destroy Israel.