I'm saying nowt. Schtum. Shhhhh...
No, seriously. Could never find a straight or unheated answer to the Q in the past, but like so much of national histories, the spark point usually lies far, far back, in something quite different to the current situation. There are so many festering sores, like the Turks and Armenians, and it's all down to just sometimes the inanity of vanity (oh, that rhymed!): not wanting to apologise for some terrible wrong done 500 years ago by A to B, because one looks 'weak' or 'loses face'. Actually, I think it takes a lot more strength to say sorry than to carry on being a prick, but there you go.