"I seem to remember that one of the acts of the invaders was to blockade Gaza so that essential medicines and food could not be got in; "


You mean like the night vision equipment and mircoswave ovens that they tried to bring in during the daily 3 hour Israeli cease-fires ( to allow food and supplies into Gaza)? Or do you mean the rockets, morters, and armamant that they smuggled in, instead of the "essential" medicines and food?

You confuse REGULATED supplies with unlimited- The supplies that were inspected and shown to be food and medicine were allowed in- But Hamas still smuggled in arms instead of food. THAT shows what the priorities were.