@Walter Hinteler,
Are you saying tha the Gaza strip has no borders with any other country besides Israel?
Have you ever looked at a map?
They share a border with Egypt, so that is one way the can import stuff.
They also have a seacoast they can import stuff from.
The fact of the matter is, Hamas does not want to do anything to help their citizens.
If they actually were to try, it would show to everyone just how corrupt and worthless Hamas is as a governing body.
Israel is not required to provide any type of support to the GazaStrip.
After all, Gaza has its own govt.