Think about what?
I think the teenagers in this incident need to rethink their hobbies if they view throwing rocks at border patrol agents, as they illegally cross an international border, as some kind of school yard game. I wouldn't count them amongst the highest IQ'ed individuals I've witnessed in action.
I'd like you to riddle me this though, next time you see a cop, even if it were a simple traffic stop for speeding, get out of your vehicle and start chucking rocks at him. If he draws his firearm on you, just keep tossing those rocks at him, I mean, they are only rocks after all, no one has ever been hurt or killed from a rock being thrown, right?
If you aren't shot, I would be surprised.