Quote from Ricter:
Your argument is not really about the topic of this thread. There is no a priori reason to believe that, in general, immigrants are more or less honest than the members of the society they're joining. It's true, they may not assimilate well if at all (it's always their kids that assimilate better, and more so their kids' kids) and the current citizens may not like their language, their dress, religion, art, foods, smells, etc., but they may be as honest as anyone else. In other words, you may dislike their culture and appearance very much, enough so that you feel you have good reason to distrust them, but if they give you their word they may be just as likely as anyone else to honor it. All other factors (which do not bear on honesty per se) being equal, it's likely they are just as honest.