You _do_ know that the rockets are not guided, right? The terrorists used guided weapons when they can; for example, when they fired at - and hit - a school bus (and no, not possible to mistake it for something else). They killed the schoolkid inside. These are the people you are defending. Furthermore, you do know that the law - and common sense - looks at intention, right? If you shoot at someone and miss, you are still as guilty as you would have been if you were a better shot. And any nearby police would draw their weapons and kill you if you were shooting at someone, even if you had a poor aim.