Not necessarily, not one sole thing in Mexico makes EVERYBODY happy. There will always be some downer who can find away around it. Lets say right now, I hate EVERYTHING about Mexico. not a single thing makes me happy about Mexico. Now what? it is unsound is what.
Well, for every thing that makes one person happy, you could come up with something about that thing that makes another person un-happy, canceling it out in a way. One person may like they food, one person may hate it. One person might like the oxygen, one person might think its dry and smells bad. So what it all boils down to is that it really is all that simple. Mexico DOES make people sick.