Movie’s message - who are the good guys and who are the bad guys?

Is that an accurate interpretation?

The Mexican boy sells guns to cartels. He breaks the law. While Harris is ATF, a law enforcement official. Instinctively, you’d think Harris is good and the Mexican boy is bad.

But the Mexican boy takes Harris in the car instead of leaving him on the street, as the white boy suggested. He feeds Harris, gave him water. He gives Harris aspirin. He unloosens Harris’s handcuffs after the guy put them on too tight. The boy didn’t have to do any of that. He could have been totally rough and negligent with Harris. That the boy shows kindness means the boy is a good person. And of course, the boy also saves Harris from death by shooting the uncle.

Then Harris viciously leaves the boy to die in the desert, after all the boy did to help him. What makes this act heinous is that the movie did not imply that Harris had to do it; the boy wasn’t a loose end or anything. He could’ve taken the boy to America and let ATF / his supervisors decide what to do. At the very least, he could have dropped the boy off near civilization to give the boy a fighting chance. The act was totally murderous and really revealed Harris’s character. His facial expressions indicate offensive indifference to the boy’s life.

In addition, the viewer learns that Harris has a wife and a son. This detail implies that all we saw from Harris previously was, likely, fake, a ploy he used to get himself out of the situation. This revelation also means that Harris cheated on his wife with the gun show lady. This makes him appear even sleazier.

So although Harris is law enforcement, one of the good guys; and the boy works for the cartel, the bad guys — the movie seeks to challenge our ideas about who is good and who is bad.