And why shouldn't they. The negotiation could have collapsed at anytime. Nothing had changed, Hamas we're still firing rockets into Israel.
Your making some massive assumptions and jumping to some huge conclusions based on what. You've already said you think Hamas sound incompetent, but you think their organised enough to round up all the hostages and guarantee their safety over the next six weeks.
Do you honestly believe the lives of those hostages is any more secure, just because there's a ceasefire in place. The risk to those hostages at this moment in time is not Israel. The full responsibility of their lives is in the hands of Hamas and any other armed faction in Gaza. As it has been for the past 15 months.
It takes a second to take a life. Remember Ori Danino, Carmel Gat, Hersh Goldberg-Polin, Alexander Lonanov, Almog Sarusi, and Eden Yerushalmi.