I doubt Kev was trying to inject racism into the conversation, but rather Mexico bashing. They've had a lot of bad press where the media is constantly running stories on how dangerous it is down there because of the drug war, recently the swine flu, and don't forget the endless illegal imigration stories. To be honest, most places in Mexico are no more unsafe for us Gringos than most cities in the U.S. unless you're either in Mexican law enforcement, or somehow connected to the drug cartels. I have a lot of sympathy for average Mexicans that get such a bad rap because of things that are going on that they have nothing to do with. Don't get me wrong, I'm seriously opposed to people coming into America illegally, but that's still just a small percentage of the Mexican population. We all have to fill out forms on the plane saying where we're staying, how long we'll be there, and we all have to maintain a valid passport(ID) when we go to Mexico. It should be the same way when Mexicans come here.
It is the same way when Mexicans come here on the plane, though probably not as easy (I believe they have to have a visa as well, something we don't need when traveling to Mexico).
In the old days, i.e. when I was a kid, there was no need for any documentation besides ID for Americans to cross back and forth across the border on foot or by car, as long as travel was restricted close to the border (on the Pacific side, the limit was a little ways south of Ensenada). They'd wave us across without any need to even stop the car, and we'd line up on the crossing back to declare how much tequila we were bringing back, the simple oral declaration of U.S. citizenship was enough to satisfy the INS border guards in most cases.
I crossed illegally into Mexico once, when we took our train south. Mexicali, the origin of our trip, was in the zone where you didn't need a tourist card, and I was supposed to obtain one at the train station the morning of our departure. Unfortunately they were closed that morning, so we went without tourist cards. Coming back, we ended up flying, as I got some bug that I really didn't want to suffer through the duration of a 30-hour train trip. Presenting our tourist cards at the airport prior to boarding the flight was a necessary requirement, so we got to the airport the day before our flight to work it out. Ended up being sent to some office upstairs and eventually we were given tourist cards. It took about 3 hours total, but I'm sure I would have been able to cut through the red tape a bit quicker had I offered bribes along the way.
Another time, before I had turned 21, we were crossing back to the U.S. on foot. The INS agent asked for my ID, mainly to prove I was over 21 and legally able to possess the booze I was bringing back. I made up a story about how I had completely forgotten my ID, how stupid, but I really, really was over 21, honest officer! After enduring a brief lecture on how dumb I was for traveling in a foreign country without any ID, he let me back into the U.S., booze and all. Those were the days!