Maybe it's been discussed, but do you guys think killing the kid was really the smart choice (morality aside, of course)?
I'd never question Mike's logic, but this kid didn't really witness a crime. Technically, it was a crime, but it was a crime that'll never be reported or noticed.
In fact, wasn't the whole point of the caper to do this in a manner where there'd never be a crime reported and no need for murder?
The kid saw 3 dudes in a desert hooking up hoses to a railcar. He has no idea what the hell was going on. He could've easily thought this was some sort routine procedure.
Obviously, a tricky scenario, but the worst this kid would've done is mention seeing something odd in the desert. Maybe he arouses some suspicion, but again, there was no crime that will ever be reported.
Maybe someone comes out to that location to check things out, maybe not. If they do, they leave quickly. It's hot and nothing bad has happened, as far as anyone knows.
Now, I can assure you that people are coming out to that location. Only this time, they aren't leaving without answers.