Impressively amoral post, but this is insanity.
(1) Israel doesn't exist in a vacuum. It is not self-sufficient.
(2) There's something monstrous about keeping 2M people herded up in a closed pen.
Whether or not those people are "threats" shall remain to be seen, but Israel is going to lose (is, already, losing) the hearts and minds of everybody on the planet under age 40 -- and you're going to see what being a real pariah state feels like. Israel won't survive as a state very long after that; it is a hard thing, to be despised. And yet, if it comes to that point, it will be very richly deserved.
What you need is a strategy which improves the lives of Gazans -- not one that bombs their homes to rubble and sets them back a thousand years. You need to address their very real grievance. Without this, you're both sunk. Gonna end in tears, like I said.