I doubt that anyone will dispute your concept of "illegal alien". Yes, there are people - identifiable because they're Mexicans and easy to spot (well, some might be from Guatemala or Ecuador or  anywhere south of the border. They all have dark skin and talk Mexican) The difference in perspective is what these people bring to us. I'd much rather exploit illegals than spend a day wading through entrails at a slaughter house or meat packing plant, or stooped over in the hot sun picking berries. I suppose you will be working in the agriculture field soon?