"Mexico" is a rather large country. Some of you are being really, really silly. I've worked with a lot of international offices, though, and they are equally silly so don't feel bad. A lot of them fear coming to the US because they've seen a story or two on gang violence, or drive-by shootings, or how there are evil drug dealers willing to kill you if you're in the wrong place at the wrong time, or how rude people are, or how New Yorkers would rather watch you get beat up (and film it for YouTube, of course) than lend a hand... the stories are cliche and trite and often localized incidents. I have had, no lie, someone from the Netherlands ask if they were going to be okay going to an office in Chicago during hurricane season. They didn't want to get caught in a storm. The amount of "wrong" in that question is amazing to behold.
Mexico has good areas and bad areas. Areas that see a lot of tourism and retirees are going to be built up and modernized. It's all the better to attract that outside money, and of course the actual Mexicans living/working in those areas do well catering to the outsiders. There is more money for beautification and there is less obvious violence and crime. There are pickpockets, sure, and there is still corruption... but it's not what you hear about Juarez.
Juarez is a shithole. You get the distinct impression, approaching Juarez/El Paso from either side, that you might not survive the crossing. It is pretty much the height of every nasty rumor you've heard about Mexico. If you can avoid crossing here, it's a wise thing, so long as you have reputable people helping you cross elsewhere. Juarez, though, is where a lot of the reputable crossings happen, so you wind up there and you notice it's bad. Really just nasty.
Why would anyone go to Mexico? To go to the non-bad areas, or to retire for fairly cheap. The college kids go because there is plentiful (but really nasty) liquor and beer flowing, and the nice hotels are pretty cheap. The beaches can be beautiful, the activities (assuming you want to do anything but drink and screw?) are plentiful. Of course, every year someone dies, but that doesn't discourage anyone. A good portion of them are Darwin Award candidates who would not have lived much longer at home.