Trump’s threat to shoot any stone pelters among the Central American caravan is not to be taken lightly. Soon after I moved to the Rio Grande Valley, a teenager on the Mexican side of the border from El Paso was shot & killed by a US border patrol agent who claimed the boy was throwing rocks. I still have my placard from protesting that incident. This LA Times article from 2015 points out that out of 67 such shooting incidents with a fatality rate of 19 Mexicans dead, all US agents were absolved of criminal misconduct with three cases then pending.
http://www.latimes.com/nation/la-na-border-patrol-shootings-20150615-story.html?