Plenty of states have stand your ground laws. And the law isn't the issue.
The issue is who instigated the confrontation and what happened to make the Mexican feel threatened enough to use a gun.
If Mexican instigated the confrontation then stand your ground doesn't apply anyway. Since he was the instigator.
If the kid did but wasn't posing a life or injury threat then stand your ground doesn't apply and it becomes a issue of justified or unjustified shooting.
If the kid started the confrontation and did pose a life or injury threat then stand your ground does apply and the law worked as intended.
But as you already know one of the first two is probably what happened. If it was the first then this was murder. If it was the second then the Mexican needs to at least be investigated and the shooting ruled self defense or not. If justified then case closed if not then the Mexican needs to face whatever punishment he gets.
The issue is who instigated the confrontation and what happened to make the Mexican feel threatened enough to use a gun.
If Mexican instigated the confrontation then stand your ground doesn't apply anyway. Since he was the instigator.
If the kid did but wasn't posing a life or injury threat then stand your ground doesn't apply and it becomes a issue of justified or unjustified shooting.
If the kid started the confrontation and did pose a life or injury threat then stand your ground does apply and the law worked as intended.
But as you already know one of the first two is probably what happened. If it was the first then this was murder. If it was the second then the Mexican needs to at least be investigated and the shooting ruled self defense or not. If justified then case closed if not then the Mexican needs to face whatever punishment he gets.