A Guatemalan man living in Massachusetts for 13 years turned himself in to local police and confessed to fraud and identity theft, all in order to secure a deportation order and avoid paying for a ticket home. The details are a bit sketchy but the man has neither a job nor money saved up and said that he was worried that he wouldn't survive the winter. After reportedly confessing to police, he pled not guilty. The above article doesn't say whether he is in the States legally or not.
I was going to use the above as an illustration of how screwed up the US immigration system is, but this is such a bizarre case that I think extrapolating any broad points from it would be unwise.