I don't know why the kid had to die. He was like what, 10-12?
1. He's a kid, what is he going to tell mom/dad? He saw men working/doing something near the train tracks? Then what will the parents think of it? Most likely
it off.
2. The owners of the product will never know that Walt stole it. They will only think the Chinese cheated them out of a more potent version. So it can't be traced back to the incident.
3. The kid wouldn't have probably even told anyone about it if they just buddy buddied the kid about it. I mean you can tell the kid anything, that they're refueling the train, oiling it up, anything and he would have probably believe it. Again, this looks like a young ass gullible kid.
So yea. WTF