is an obfuscation of what "collective punishment" is and it is not applicable here. If a blockade WAS "collective punishment" then it would not be allowed by statute in international law. Please provide evidence that says the BLOCKADE is illegal not evidence that "collective punishment" is illegal, as they are two different things.
Alan Dershowitz on the blockade:
First, there is the Israeli blockade of Gaza, which included a naval blockade. Recall that when Israel ended its occupation of Gaza, it did not impose a blockade. Indeed it left behind agricultural facilities in the hope that the newly liberated Gaza Strip would become a peaceful and productive area. Instead Hamas seized control over Gaza and engaged in acts of warfare against Israel. These acts of warfare featured anti-personnel rockets, nearly 10,000 of them, directed at Israeli civilians. This was not only an act of warfare, it was a war crime. Israel responded to the rockets by declaring a blockade, the purpose of which was to assure that no rockets, or other material that could be used for making war against Israeli civilians, was permitted into Gaza. Israel allowed humanitarian aid through its checkpoints. Egypt as well participated in the blockade. There was never a humanitarian crisis in Gaza, merely a shortage of certain goods that would end if the rocket attacks ended.
The legality of blockades as a response to acts of war is not subject to serious doubt. When the United States blockaded Cuba during the missile crisis, the State Department issued an opinion declaring the blockade to be lawful. This, despite the fact that Cuba had not engaged in any act of belligerency against the United States. Other nations have similarly enforced naval blockades to assure their own security.
Israel's critics have failed to pinpoint precisely what Israel did that allegedly violates international law. Some have wrongly focused on the blockade itself. Others have erroneously pointed to the location of the boarding in international waters. Most have simply pointed to the deaths of so-called peace activists, though these deaths appear to be the result of lawful acts of self-defense. None of these factors alone warrant condemnation, but the end result surely deserves scrutiny by Israeli policy makers. There can be little doubt that the mission was a failure, as judged by its results. It is important, however, to distinguish between faulty policies on the one hand, and alleged violations of international law on the other hand. Only the latter would warrant international intervention, and the case has simply not been made that Israel violated international law.
http://www.huffingtonpost.com/alan-dershowitz/israels-actions-were-enti_b_596285.html