See, thats where you're not understanding. They're not trying to win anybody over. The entire point of their campaign is to cause so much damage to anyone trying to fuck with them that in the future, people will think twice before launching that rocket into Israel.
Take this for example, you bully some kid because he looks funny and speaks with a lisp for a couple years in highschool. Then one day, you come home after work to find all the windows in your house broken, your kid brother with a black eye and a broken leg, and a note taped to the front door that says 'knock it the fuck off or else'.
Are you ever going to fuck with that kid again? I didn't think so.