Also, your simple report of the collapse of the prior ceasefire is challenged by the Shalom Center, which sent out this report:

Israeli Intelligence authorities, in a Web posting on November 16, reported that rocket firings from Gaza had been extremely few from June, when the ceasefire began, into November. In June, 5 rockets and 4 mortar shells; in July; 4 rockets and 8 mortar shells; in August, 8 rockets and 3 mortar shells; in September, 1 rocket and 3 mortar shells; in October, 2 rockets and 0 mortar shells. And these, the report concluded, were being fired not by Hamas but by small terrorist groups.

Then, the report said, on November 4 Israel dropped bombs to stymie what the Israelis believed was an impending attempt to abduct some Israeli soldiers. The attack killed several Palestinians. Then and then only, according to Israeli Intelligence, Hamas sent rockets flying again into Israel .

Then on November 15, a similar scenario. Israel “preventively” attacked what it thought was a new tunnel to smuggle arms into Gaza, killing several Palestinians in the process., Again, Hamas fired a flurry of rockets. After that, Israeli intelligence concluded that it was unlikely the precious “calm” or ceasefire could be restored.