Immigrants believe in American ideals more than most Americans. Esp when most americans barely know anything about their own country. How many of us even know the bill of rights by heart?
Just because one guy is making a financial decision doesn't mean you blame a large group for some perceived lost of ideals.
There is a subset of Immigrants that move to the US, not because they believe in its ideals, but because it is financially advantageous for them to do so. Sometimes it works for the benefit of the US... as in this case. Other times... not so much.
On balance, I believe we generally gain more than we lose. Though I have no data to back up that assertion.