Great points from VickiVM. Well put.
Actually ... in reality, the opposite argument is probably true. Have you seen the Friday afternoon lines at Western Unions? Many of them illegally immigrate to earn money primarily to send to family back home. The Mexican economy is in the toilet and will in all likelihood remain in the toilet for my entire lifetime (it takes turbopowered brains and educations and access to capital markets and liquidity to run an economy ... as Greenspan, Bernacke. A reasonable economy is not created via protest), also, their government is notoriously corrupt and prone to invalidating elections. Protesting in Mexico is like protesting against ice in a freezer.
Also, regarding the US companies who set up shop in Mexico - there's an incredible international relations story there. Mexico welcomes them with open arms. Go google "maquiladoras".
My sense on illegal immigration - until there is a reasonable way for undereducated and/or disadvantaged people to immigrate legally and take the crap jobs (a guest worker program), I am hardly going to hold it against the 18-year-old Mexican girl in a mud hut who makes a run for the border in search of a better life.
I speak from two points of view here. One, from the point of view of a good friend, who just paid $4K to immigration attorneys in his ongoing effort to earn legal US citizenship. He's healthy, white, college-educated in a desirable field, and English is his native tongue. He is having an impossibly hard time clearing immigration hurdles. I don't know what planet people are on when they begrudge an illiterate Mexican with a sixth-grade education his run over the border, because all of us (including him) know that guy has no chance at legal immigration.
Second, my own perspective, because the luckiest thing that ever happened to me was to be born to healthy privileged people in the American northeast. My shot at a life that means anything was greatly improved by the luck of my birth, which I did nothing to deserve. I didn't earn this country but I'm proud as hell to live in it, and I am in favor of doing what it takes to keep it safe - but I'm totally unconvinced that a total border shutdown and xenophobia is the right approach. Keep in mind, I wake up every morning and look out the window, and what do I see? "A mighty woman with a torch, whose flame is the imprisoned lightning, and her name Mother of Exiles." Then I go home to my mother's and look at the sign my stepfather hung with some humor over the stove, just before he died: "No Irish Need Apply."
We would do well to remember our history