The previous ceasefire was of course being enforced by Jabari, who was assassinated by the IDF for his trouble - according to Gershon Baskin and Haaretz anyway though I suppose they too are self hating Jews.
He was shite at enforcing the ceasefire then, unless he only wanted a pause to rearm and renew the attack with even greater power, which was what happened.

He was also responsible for the inhuman incarceration of poor Shalit all those years, until he was exchanged for over a thousand Palestinian fighters.
The naive dupe Bashkin thought that Jabari offered some hope for peace, even though he hated Jews so badly he could never even talk to him, but even Bashkin admitted,

"Mr. Jabari was not a man of peace; he didn't believe in peace with Israel and refused to have any direct contact with Israeli leaders and even nonofficials like me. My indirect dealings with Mr. Jabari were handled through my Hamas counterpart, Ghazi Hamad, the deputy foreign minister of Hamas, who had received Mr. Jabari's authorization to deal directly with me. Since Mr. Jabari took over the military wing of Hamas, the only Israeli who spoke with him directly was Mr. Shalit, who was escorted out of Gaza by Mr. Jabari himself. (It is important to recall that Mr. Jabari not only abducted Mr. Shalit, but he also kept him alive and ensured that he was cared for during his captivity.) "