I'm gonna give a guess that Bibi considers the Israeli hostages to be convenient "liberal" sacrifices to "Hamas" in order to reinforce the narrative to his Hard Right/ZioNazi followers that the only solution is to totally wipe Palestinians out of "Greater Israel" (i.e., the Occupied Territories) so that they can be rebuilt as Jewish/Zionist only enclaves with those remaining Palestinians either exiled to Egypt or kept as slaves/fodder.