The common objection that I see to employing illegal immigrants is that it's, well, illegal. As you mentioned in a previous post, it becomes a matter of principles; you can't employ people who aren't legally able to work in this country just because they're willing to work for practically nothing.

I find it more curious that the same people who complain about outsourcing are the most devoted supporters of deregulated capitalism. I think that employing illegal immigrants is functionally equivalent to outsourcing--except that the workers are coming here. Some people bitch about both, but it's inconsistent to claim that immigrants are the biggest cause of a lack of jobs for American citizens when the Chinese are doing all our manufacturing and the Indians are all working in customer support for companies overseas.