http://en.wikipedia.org/wiki/2014_kidnapping_and_murder_of_Israeli_teenagers#Possible_perpetrators
Seems pretty likely that Hamas was behind it
I respect what youre saying but keep in mind that Israel has become a fear based political state. It's hard to be the bigger man and show civility when you're landlocked by your enemies. Israel isnt in a position to take chances, especially without a long term solution in sight.
Why was there a gag order on the investigations then? If you heard the quick sneak peak of the audio of the boys calling, you would know the man in the background yelling at the boys to get off the phone is speaking Hebrew, not Arabic. You let me know how many Hamas member speaks Hebrew?