I don't believe I have dwelled on anything??
I would never reject your opinions based on your own individual experiences. However, I think you are painting with wide brush in regard to generalizing all foreign workers having a better overall work ethic...
It has been my personal experience that work ethic, as it relates to immigrants, is much more aligned to specific cultures. Without specifically naming or signaling out any particular cultures, I can assure you that while some foreigners come here with a great desire to work hard, others definitely do not... And, while I am sure that a significant percentage the 10-30 million who have come here illegally in recent years are here to work hard, there are just as many who are here for the promised entitlements. They have no desire to be productive Americans because they have not been required to earn the right to be here...
It's also my experience that work ethic and the quality of the character of these immigrants is related to their ability and desire to assimilate to American culture. For example, I am married to a second generation Cuban-American. Her parents fled Castro's regime and came to the US with nothing. They very quickly went to work beginning with manual labor. They also quickly learned English... In short order, and with no help from the government, saved their money and re-established the small business that had been taken from them. They thrived in America by embracing the opportunity with great appreciation. They taught their daughter the same work ethic and instilled the value of personal freedom that is the American Dream that was available to them.... Lack of that appreciation and the blatant unwillingness to assimilate is proof to me that many of these current immigrants have no desire to work hard and become productive, valued citizens.