People flee peoples because they are forced by mercenary groups or drug traffickers paid for mining, desforestadores, fracking, or other transnational where in those lands there is something of interest such as gold, oil, any mineral, etc.

It is known that drug trafficking in Mexico is financed by the United States because they need to keep the people of Mexico frightened and applying the tactics of urban terror they are submitted to the people in their cities and run or murdered inhabitants of rural communities. Similar to United States finances terrorists in Syria where they trained, given powerful weapons, les sends money, gives them support logistics just does it with traffickers in Mexico.
El Chapo is operator of United States only that power and money caused that he disobeying her boss the United States and is suddenly a criminal most wanted.