Genocide doesn't actually work as a tactic, especially in an urban setting. It strengthens the victim's resolve. The Palestinian people are not known for giving up on survival.
North America of course, but Africa is an overlapping series of successful genocides, Argentina's "Conquest of the Desert", Qing conquest of the Dzungar, Russia's conquest of the Circassians, Athens and Melos 416 BCE, Rome and Carthage, Rome and lots, Mongolians and whew even more than that -- all of them victories but also a "Where are the Khazars?" sort of event. They're just gone. Violence will forever be Mankind's one true Universal Language -- easier to learn than Esperanto.
Post-Trinity, the thermonuclear deterrent has put the kibosh on genocide as a working tactic. For a bit. The evolution post Cold-War might well turn out to be that genocide is back, baby, as long as the genocidee doesn't have a nuclear deterrent. It's cosmically fitting that the great genocidal wars of the 20th century birthed the final perfected weapon for doing genocides.