I posted this Paco Calderón cartoon last week, and this morning I was thinking about this situation. I believe in following the laws of the country you reside in regardless of whether you agree with them or not, but I think the current situation is rather tragicomic. If the current US government were really serious about curbing illegal immigration to their country, they would simply enforce the laws they have regarding the prohibition of employment of people without papers (as it is done, for example, in Finland). The idea of building a fence simply smells of populism to me, trying to appease the anti-immigration constituency before the Congress elections this month.
This doesn’t mean that the governments of the countries of origin of those illegal immigrants (namely Mexico) should forget their responsibility to get jobs for their own population by ensuring the conditions for job creation by private enterprises is there. It would be unsustainable to pay for those jobs with taxes, especially since currently the tax income in Mexico is so low compared to GDP.