More h1b visas or not？

最近身边的人都在讨论h1b visa (因为一年的名额一天就用光了)。在报上看说要h1b的大多是大的IT公司，他们要求Congress增加名额。身边做IT的美国人都强烈反对。

要h1b的公司是说：America is not producing enough home grown scientists/engineers. Without foreign skilled workers, America will lose its competitive edge. Workers with h1b visas have skills rarely found in America.

身边几个做IT的美国人说：1) There are many unemployed American software engineers. Companies are favoring workers in need of h1b visa because they are less likely to quit and more likely to work overtime. 2) America is not producing enough IT workers because the outsourcing and competition from foreign workers make the field unattractive.

认识一个美国人(software engineer)，两年没找到工作。还有一个名校毕业的被lay off了，要sue公司，说discriminate against workers who do not require h1b visa。

是的，free trade (including free flow of labor) improves the economy as a whole but at the same time there will be winners and losers. Losers = Americans working in certain fields, winners = big companies with lobbying power, perhaps? And should the losers suffer for the general public, hmm, I don't know what to say...