This is taking place in Mexico where it is illegal for citizens to own guns or ammunition. These men are reacting to two things. First the drug cartels have made their families unsafe. Second their government is doing nothing about it.
These men are the militia that our founding fathers wrote about in the second amendment. They are risking everything to make their homes safer. The penalties for owning a gun or ammunition in Mexico are very severe. They are chancing that.
Note also that the ban on firearms in their country has not eliminated guns. People throughout the country maintain the guns they need. They just don’t talk about it much. The government has been unable to disarm the population.