The world's leading democracy, the U.S., is populated almost entirely by immigrants from non-democratic parts of the world and their decedents. With every wave of immigration, the claims are the same: They don't share our values, they won't assimilate, etc. It goes back to German immigrants around the time of the American Revolution (Ben Franklin had some particularly harsh words for them), and then Irish, Italian, Chinese, Eastern European, Latino, Catholic (Papists!), Muslim, Jewish, etc. etc.

The results never seem to match the theory; the current democracy and institutions of the U.S. are built by those people. Democracy means faith in governance by the people, and the very good news is that it works out very well relative to other forms of government.