Answer

I don’t know what “in favor of the whole Land of Israel” means. Do you mean that today we should go out to war in order to conquer the land? No. In some other hypothetical situation? When we get there, we’ll talk.
One can say it (the mouth can move and say anything), but it isn’t true. The fact that someone wants to kill me does not permit me to kill him. Only if he is coming to kill me. And that is so even if you are right about most Palestinians. And even if so, why should we still kill the minority that does not want to kill me?