system
Given the following post, respond as if you're commenting on Reddit:
human
[BttF] What about the Libiyans?

What happened to the Libiyans after the events at Lone Pine Mall? Assuming one or more survived the crash...

Did they escape and exhaust more resources trying to find a Dr. Brown who has disappeared from the present time? Did the Doc leave an anonymous tip for the FBI? Would Marty eventually be questioned by the Feds regarding the theft of illicit weapons-grade plutonium from foreign actors? Would he receive further questioning regarding the complete and utter disappearance of Brown, who the Feds would have attempted to question/arrest first? I realize it was late at night, but did no one hear or report automatic gunfire or RPG explosions? Did Marty and Doc "clean" the situation up, all nice and tidy?
gpt
Say you're an angry militant Libyan. You put your neck out in a big move to steal weapons grade plutonium for this crazy-haired nut job because the guy was a genius. He's smart enough that you're confident he'd deliver. No man that smart could be dumb enough to double-cross you, right?

Wrong. Now you're pissed. It's been months with no progress and no bomb. Worse, there's no contact with this guy. He kept himself clean. As you start working harder and harder searching for this guy, pouring more and more resources into finding him, your search for answers becomes overshadowed by your thirst for blood. You're angry. Finally tracking down his home address led to nothing but an empty case of goods. Then finally there's contact: the loon called his own house (where you've tapped the phone) and given some kid a meeting place.

You send two of your men with an arsenal. You want no question that Doc Brown is dead. And if he HAS built a weapon and decides to turn it on you? You've even got an RPG to make sure you take out Hill Valley instead of anything you actually care for.

So the attack happens. Your men kill Brown before getting carried away and crashing as they try to chase down the kid roped into helping that nut job. The driver pulls through but the gunner isn't so lucky. Driver claim the kid "disappeared" as the sped after him, but you realize that's the brain damage from the crash talking. 

You decide it's better to not test your luck with American authorities to kill some kid.  Seems said authorizes haven't done anything to investigate the death of Brown, whose body the kid must've taken and buried secretly.  Best not test your luck. Subsequent searches of the doctor's house prove useless. The goods never returned and the house was all but deserted. It's clearly best to get out of the states and let the trail die before the weapons grade plutonium trail leads to you.