Gaza became free from seize in 2005 itself and they have free border with innumerable underground tunnels with Egypt. We can see how Gaza has utilized it's freedom . 2010,2012 and now 2014 are the latest ones.What else do they want to free from Israel ?? Can't they leave in peace ??
Israel did not de-colonize Gaza. Israel still controls the airspace of Gaza, it still controls the territorial waters of Gaza, and it still controls the trade of Gaza, it still controls the population registry of Gaza, and all-in-all, it still controls the "sovereignty" of Gaza...hence Gaza is an "Israeli occupied" territory and this fact has been stated by United Nations, International Court of Justice, and ALL human rights organizations.
The day Israel stops colonization of Palestinians, violence will stop. Israel is the colonizing terrorist state and the responsibility to all violence lies on Israel.
Again, the key word for you is the "Colonization"
De-colonize Palestinian territories completely and let human rights organization and International Court of Justice declare that Israel no longer remains the colonizing power in Gaza, W.Bank, and E.Jerusalem. After that, entire world will support your stance.
Till that happens, Israel remains the colonial power and hence remains responsible for ALL the violence stemming from this conflict.
See here, United Nations itself clarifies that it considers Gaza an "occupied" territory under International Law.
When you control airspace, territorial waters, trade, and sovereignty of a foreign people by FORCE, then you ARE the colonizer. It is very clear in International Law as even UN says it. Israel does all of the above to Palestinians in Gaza, hence it is an occupying force. Same goes for W.Bank. It is declared an "occupied territory" by International Court of Justice. Israel is the colonizing force.