I can answer that one, the ones wanting to come here legally are just as or more motivated and are probably better educated. Many illegals simply don't respect the law because the law is "flexible" in Mexico. The immigrants that built this country had entrepreneurial spirit, these illegals are here to dig ditches or whatever they can find.
I agree with 1,2 and 4. Number 3 I would caveat that it must not dimish the quality of life or "general welfare" of the people. Government involvement normally has a bad effect on markets but NO involvement can be much worse.
Hyper-capitalism can lead to oligarchies where only the elite have and can maintain wealth. Corporations do not have a conscience there mission is to make as much money as possible and apparently partiotism takes a back seat to that goal.