Why the Gaza ceasefire has effectively collapsed

Hamas was motivated to agree to the ceasefire because of the vague promise that it held for a permanent end to the war and cessation of fighting. For Israel, the most popular part of the ceasefire was getting back its captives, not ending the war.

Hamas's public captive handover ceremonies during phase I, where they displayed their military coherence, only reminded Israelis that they failed in their goal to eliminate the group in full, as the government had promised. 

The political costs of resuming the war are also shrinking for Israel's government. 

Read more: Israeli Prime Minister Benjamin Netanyahu could find it in his interest to resume Gaza war, as Arab states rush for post-war plan