Perhaps. Indeed, it seems likely that they were killed when it was clear to their captors that they would not play a role in hostage negotiations, but rather were to be freed soon by troops closing in. But lets say that the terrorists would have demanded a price for their lives that ultimately would cause more bloodshed than six lost lives, and Netanyahu would have bowed to pressure and agreed. Is that what any of us want?
I think the real argument here is whether we think that had the government wanted to, they could have both negotiated a deal and also not compromised Israel’s security. The other side is that inasmuch as that has not been the case, why imagine so?