As someone to the Left of politics, I am not as pessimistic as you, although I completely understand the concern. Humanity has survived the worst of privations, genocide write large with "ethnic cleansing", Rwanda, the Shoah, China/Nanjing, Australian aborigines and so the deadly roll-call continues. But...

As we are seeing, people fight back, hence the term 'urban guerilla', normal humans pushed to superhuman limits to fight against a far mightier foe and to overcome all odds to emerge free from the shackles of oppression. While this in no way condones the alleged barbarism and terror of Hamas' raid on October 7, sadly it is understandable and the astonishing response of the world to Israel's disproportionate response is heartening. Remember the outrage of the anti-Vietnam War movement which led to the rout of the West in 1972/3. Remember the anger about Iraq's phantom 'WMD'. Remember the public anger and sorrow at the wasted time, lives and resources in a failed "move to democracy" in Afghanistan.

I don't think the world will descend into the chaos you fear. The human record shows an indomitable spirit for survival and a kind of natural justice which recognises an overstepping of a moral mark. While that mark may be a movable and seemingly arbitrary line, generally sense prevails in terms of fairness.

Should I be wrong, despair would take hold irrevocably and humanity would fall into an existential abyss. My sole hope then would be there would be a sort of Darwinian selection, although what that would mean in terms of humanity remains obscure. It would not be good.