According to an AP story:
"Police enraged by the kidnapping of six officers club unarmed detainees. A bloody battle between steelworkers and police leaves two miners dead. Drug lords post the heads of decapitated police on a fence to show who's in charge.
Less than two months before Mexicans elect their next president, many fear the country is teetering on the edge of chaos - a perception that could hurt the ruling National Action Party's chances of keeping the presidency and benefit Mexico's once-powerful Institutional Revolutionary Party, whose candidate has been trailing badly..."
To top it all off, a recent Mexican poll found 50 percent of respondents feared the government was on the brink of losing control.
No wonder they're flocking here in droves.