Maybe "makes them" is a little strong. But there's certainly something in the way of an intriguing correlation:

Barak consented to ease the near-complete closure imposed on the Hamas-controlled territory, authorizing the entry of humanitarian aid and a one-time shipment of diesel fuel to power Gaza's electricity station less than a day after it was shut down. Shortly after Barak's pronouncements the relative respite in rocket attacks on southern Israel seemed over, with nine Qassam rockets and 13 mortar shells landing in and around communities in the western Negev.

On the day before the lockdown - which involved a less than staggering 30 percent energy cut and no fresh fruits or vegetables - the Palestinians launched forty rockets at Israeli schools and hospitals. Immediately after the lockdown, the number of Qassams dropped to one because Hamas got the message that the Israelis were serious about protecting Sderot.

Then Barak lifted the closure ever so slightly, and the Palestinians immediately launched over 20 more Qassams and mortars. This is surreal. These people are lunatics. And the UN is set to condemn Israel. Of course they are.

References:
* Sderot residents: Barak folded, now Qassams are back [YNet]
* Palestinians Shut Down Generator To Create Gaza Humanitarian Crisis, UN Blames Israel [MR]
* UN: Gazans Have More Than Enough Food, But Lack Of Fruits And Vegetables Is A Humanitarian Crisis [MR]
* 6 Palestinians killed in clashes with IDF [Ha'aretz]
* 'Hamas stopped launching Kassams for fear of Israeli attacks' [JPost]
* Israel trying to thwart UN condemnation of Gaza blockade [Ha'aretz]

Previously:
* Palestinians Embrace Peace By Dropping Dozens Of Rockets And Mortars On Israeli Schools And Hospitals
* Palestinians Fire 9 Kassam Rockets In 24 Hours At Israeli Schools and Hospitals
* Israel trying to thwart UN condemnation of Gaza blockade

Cross-posted to:
* Israpundit