All I'm saying is that just because Israel says it was a mistake doesn't mean it was a mistake. They use the "mistake" claim to cover up atrocities they cannot deny.
I looked for the link you asked for and I can't find any article that mentions Hamas' motives at all. Regardless...what else would their reason have been? Hamas historically (during periods of ceasefire) waits for Israeli provocation to strike. Granted they're waiting there with their fingers on the trigger, but they wait nontheless. Israel always provokes. It is in their interest to perpetuate the conflict, Hamas is their best friend.