Neighbors said Hadayet lived quietly, but became incensed when an upstairs neighbor hung large American and Marine Corps flags from a balcony above his front door after Sept. 11.
Probably as common as today, it not more so. A 100 years ago the new arrivals certainly had their share of violent anarchists, communists, agitators, bomb throwers, criminals (organized and otherwise), and even terrorists.
Wasn't President McKinley assassinated by an immigrant anarchist? (If not, there were plenty of other violent acts committed by immigrant anarchists). And what of the Italian and Jewish mobs? And Sacco and Vanzetti? And the 1920s Red Scare (which was largely aimed at new immigrants, with some good reason)?
And the Anglo-Saxon Americans threw their hands up, and with all honesty and good intention, expressed the same panic as you.
But most new immigrants were not violent, and they assimilated and learned to love America. Today's new arrivals will too.