If you are in this country illegally, you are already breaking our laws and should be deported A.S.A.P.! Enough said. There are, and will always be room for all peoples from all nations to come and become a U.S. citizen of this great country. There are legal means of entering this country, and I strongly recommend it to all aliens. However, when you come across the border illegally, you are shunning our laws which we as U.S. citizens have to abide by. From the moment of entering our country illegally you will be breaking our laws from that point on.
I live right across the border of Canada and visit there quite frequently. Just try getting back into the U.S. from that border without a passport or some kind of proof you are a U.S. citizen! They also randomly pick vehicles and people to search to make sure they were all is legal. Why can't the southern borders be that tough?
In fact I think that it might be harder to enter Mexico than to come back to the U.S.A. When I visited Mexico a year ago, coming back across the border was a joke! We could have had a van full of illegal immigrants. No one checked or asked for our US citizenship papers, all they did was ask what country are we from. No search or even a sneak peak in the vehicle. Enough said!