They're not talking to Israel. There talking to the media and libs so they'll put the pressure on the IDF to let up.
They know better than to kill their only bargaining chips.
Those “bargaining chips” were dead by day 5 of the conflict, otherwise why not show them on live television done by an impartial observer.
Give the hostages some current news event that has nothing to do with the TERRORIST ATTACKS and have them give a live opinion, just to prove they are alive, even if not well!