Your text still doesn’t explain the why. Why were they tortured and killed?
That’s for the Mexican police and US authorities to figure out. American tourists get robbed there all the time by the cops and others. These kids likely didn’t have much money.
In Tijuana, they randomly murder each other and murder for drugs. Life is cheap in TJ.
2,000+ homicides in the past 12 months. Chicago is much safer, so is Kabul.