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I think the answer is that it depends upon who is talking and how the question is asked. Many recognize that it helps the US to import great talent. But people also recognize the downward pressure on wages and the sometimes explicit racism that appears. It's not usual to hear stories of managers who only want to hire people with the same skin color.

So if you ask the question in general, you'll get some basic support. But if you ask, perhaps, about H1B abuse you'll find that people will often confirm that it occurs.