(CNN) -- By now it should be painfully obvious that this latest round of the Israeli-Palestinian crisis in Gaza is fundamentally different than its predecessors. Unlike the two previous rounds in 2008-09 and in 2012, which ended after three weeks and one week, respectively, this round, now in its fourth week, is infinitely more complex. The rapid failure of the cease-fire put in place by Thursday's agreement only emphasizes that fact. Getting to de-escalation, let alone a durable endgame, will be hard. And here are the five reasons why: 1. Hamas, the political/military paradox: One of the reasons the conflict has dragged on for so long is Hamas' anomalous situation. It entered the crisis -- indeed may have helped to trigger it -- because it was weak, financially bankrupt and politically isolated, and thought it could get Israel and the world's attention through violence. This political weakness has now raised the stakes.
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Cease-fire fails in Gaza after less than two hours
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Aaron Miller: The latest events demonstrate that this conflict is very different from earlier ones
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Both sides lack the urgency to make concessions needed for a lasting peace, he says
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Miller: Iron Dome has given Israel more room to fight; Hamas is going all-out for unlikely victory
The prospects of some kind of an expanded @placeholder operation into Gaza are highly likely, with all the casualties that could entail.