I know this may seem like an impertinent question to ask. But given that:
Israel withdrew from Gaza in 2005
The only IDF soldier there for most of that time was the Hamas captive Gilad Shalit
Gaza is in no real sense "occupied territory"
A lot of this stuff seems to end up sold by Hamas or on the black market (or both) and the terrorist organization presumably funnels the money into arms sales...
Gaza shares a border with Egypt, which now keeps it at least partially open
There is no humanitarian crisis in Gaza
The UN says Palestinians have a higher level of development than Egyptians, or for that matter, South Africans or Pakistanis.