My own take is that humanities history of repeating its atrocities is based less on a lack of knowledge, IE. “Those who don’t know history are doomed to repeat it.” and more on personality then anything else.
I don’t think that such evils can be deleted. They can be reduced, as they always have via the actions of persons like yourself, but I don’t think that they can be destroyed.
As to hate devouring humanity whole, however destructive people have been(lets pretend that nukes don’t exist for a moment) they have always been incapable of completely destroying themselves. Because whoever survives the hate fest reproduces.
In this disturbing times, I try to recall that it could be worse, because throughout history, it has been many times. That doesn’t mean that we should give up on trying to make it better though. I’m just trying to find a perspective that allows a modicum of my sanity to endure.