To be a Hamas supporter in Israel is advocating for the destruction of your country and fellow citizens, Ben Gvir may be a reacist, a hothead and a loose cannon. But he is only shooting off his mouth. In Gaza, Hamas murders its people for much much less.
If you support killing everyone in Israel who is accused of supporting Hamas, that is crazy. If you support killing anyone in the world for that, thae you are dangerously insane.