What worries me are the very bottom — the folks, who come over here knowing, that they may be able to get foodstamps and other hand-outs, that our schools and hospitals will teach and treat them for free.
Of course is though that most recipients of footstamps and benefits are americans. Immigrants generally flock to first world countries like the US in order to work hard and lead a better life. They generally do the work that people born in the US feel is beneath them or agree to work for far less than them. They will live in smaller rooms, pay less in rent, work longer hours and generally put up with a ton of shit just because it is still better than the country they were born in.
The net result is that the people who suffer from immigrants, both illegal and legal are the sort of people who are also competing for the same dead end jobs, exactly the sort of people who feel they are entitled to those jobs just because they were born here.
Those of us who feel we are entitled to jobs because we are the best person to do the job generally have nothing to fear from immigrants, but we do have a net gain as we can get someone to work of our house, iron our shirts or do our cleaning for a fraction of what someone born in the US would charge. We also benefit from being about to go to the all night food mart to get beer or whatever at a time when most people would demand double time to go to work.
Even the H1B system is often a net benefit to us as the sort of people brought over here under those schemes often reach a glass ceiling pretty quickly and we ultimately get made their boss when they are passed over for promotion for the 5th time even though they work harder.