[crpatino]

Because if you don't let them come in and compete fairly, your employer is going to bring them anyways, at half of your salary, and let you go with a kick in the ass.

Those are not your jobs, those are jobs for the take. If you don't like the situation maybe you should consider aligning your interest with the people that is in the same boat with you, not necessarily with the ones who happen to share your nationality.