This has very little to do with these folks being Americans, and very much to do with them being (I assume) of European origin. The peasants in that part of Mexico are direct and usually unmixed descendants of the various indigenous tribes that lived there before the Spanish arrived. They view Europeans and people of European origin as land stealing interlopers, and have for the past 484 years.
Any knowledgable wealthy Mexican would not to buy a rancho in Chiapas unless he also had the money to hire armed guards and the political clout to see that they had machine guns.
Lesson? Make sure you know what the h#&@ you are doing before you buy a bunch of "cheap" land in some foreign place and move there.
Lesson: You "own" property only to the extent that you have the right to defend it against anyone who might want to take it, or have a reliable entity who will defend it for you. If somebody can walk over and take it without consequence, you don't own it.
One of the reasons for the Second Amendment