If you want to know more about the tensions that led to this tragedy I suggest you read this article by border report, a website set up by the local NBC affiliate in El Paso, Texas to cover immigration news. They reported weeks ago about the tensions that were building up between local residents and migrants, including the harrasment of women by the migrants. https://www.google.com/amp/s/www.borderreport.com/immigration/border-crime/mass-migrant-crossing-attempt-was-senseless-irrational-act-mayor-says/amp/