To give in to the guaranteed release of prisoners will be twisted by Hamas as a victory for themselves, and weakness on the part of Israel. Just guaranteeing more violence against Israel and the Palastinians up the road. That is what history has taught us. At this point, only total capitualion by Hamas will do. No Deals! Then Hamas will appear weak in the eyes of the Palastinians, they will regret having elected them, and may finally seek an alternative for their children that is not based on violence.
U.S. to defend Syrian rebels with airpower, including from Assad (Reuters)
from the article: Gaza groups ready to deal on cease-fire, release of Shalit