Stupidity: Spoiler. In a typical 'why didn't he do it before?' twist that kinda invalidates the rest of the movie, it turns out that the villain has had a third Will Smith clone all along, ready for deployment in Yemen and with fear and pain genetically removed, ready to blindly kill anyone, combined with so much body armor that even point blank AR-15 carbine shots barely faze...but he sent the 'prototype' he raised like a son instead, in a hoodie and baseball cap.
Stupidity: Despite the fact that the villains know exactly where Brogan is for the better part of the movie thanks to a tracer, and that they display constantly that they are able and willing to hit with bold military operations even to the point of hitting an urban area overruling law enforcement (apparently Clay has authority to do that too), Brogan is able to get undisturbed back in the US through his friend's plane. Considering he was officially marked as a rogue agent and killed 8 DIA operatives, it's hard to see how Baron's plane could ever land on American soil after a long intercontinental flight.