Human history is a history of conflict and misunderstanding. Will it ever stop?
I think this quote shall suffice :
"We're both of the same breed, after all… motives for war are of no concern. Religion, ideology, resources, land, grudges, love, or just because… No matter how pathetic the reason, it's enough to start a war. War will never cease to exist… Reasons can be thought up after the fact. Human nature pursues strife."
The History of man is one of conflict, as seen by books like "The better Angles of our nature" (by Stephen Pinker).
Shall human conflict ever end? Or shall we always enter endless cycles of retribution and hatred? And History shall repeat itself.