But who knows, maybe a majority does support it. Even then I think given the real facts and the right message, information, and an ACTUAL ALTERNATIVE route (as Chaim proposes in his video on this subject), the Israelis would choose more wisely. As it stands right now, they have all the Hebrew papers telling them on a daily basis the deal is a good thing, and that there is no other way to go about it that we are capable of doing if there is no deal. Constantly bombarded by this message and no alternative will get people to say and think stupid things. Also you could have a pressure to vote a certain way like if the question was framed in a certain way by the pollster focusing on the missing soldiers, or 'efforts to get back the POW's" it invokes sympathy. I don't think Israelis would want Kuntar released if they knew the rap sheet and the circumstances in full.
But plant the seeds of a radical idea and suddenly a person will have an epiphany and say "wow, you know what, he's right! Why don't our leaders ever make sense?" This is really the power of hayamin haamiti.