There's actually no hope for mankind, IMO. My greatest doubt is about wether it will be nature that will get rid of us, or ourselves. The dinosaurs died, whatever the fvck came before the dinosaurs also died, countless civilizations we probably don't know anything about also disappeared, and we are no better or more special than any of those. We didn't do anything special to deserve existing forever as a human race, and nature doesn't own us anything. All we can do is wait for the day we also become dust, and oohh, what a glorious day will it be, and it will be of no consequences whatsoever that we disappear.
It was always like that... "my country, civilization, religion is better than yours, and it is the right one, therefore you(the opposing forces) are evil and deserve to be exterminated. So let's enter a war, and create suffering and famines for people that couldn't care less about our conflict. Why? Because we are great, special, the children of god walking over this planet, and blah blah blah". It doesn't matter what they say, or what excuses they may give, at the root of all this lies the dualistic thinking of man, something the oh so smart and advanced, space exploring human race wasn't able to even scratch the surface of. As long as duality is there, the desire to kill, for control over others, burning lust and greed will be there. The ego loves misery, for itself and others.
So let them, let the boys play with their precious destructive weapons, let them make satellite laser beam attacks over some cities and kill millions, let them show the world how great and superior they are. There's nothing we can do other than watch the destruction and killing with a feeling of joyous amusement, knowing that the "human dream" is finally coming to an end.