Not many of them are willing to do the genetic testing for fear of what they might find, which should tell you something. My wife and I were excited to see what came out and it was interesting, I had no idea I would have any Mongol ties (not unusual about 25% of the world does) despite being mostly Irish/British/German/Swedish. My wife had been told all her life she was Italian, come to find out, not one fucking bit, she's British, Irish, North African, Cherokee and a bit of other northern European.
It really just went to show me, we aren't all entirely what we probably think, we are all more or less mutts, and that's perfectly fine. If anything, it's encouraged both of us to learn more about cultures that we didn't know much about. Educating themselves aren't these people's strong suits, so beyond learning what they don't want to find out in a factual manner, they have no interest in learning about where they may come from. So yeah.