As far as I can surmise, the reason that the Bolivian president complied was due to the fact that had he not, it would at the very least, be seen as an act of a

As far as I can surmise, the reason that the Bolivian president complied was due to the fact that had he not, it would at the very least, be seen as an act of aggression, and could possibly be seen as much more. Though they wouldn't threaten to shoot the plane down per se, you can bet they'd send up a few armed and loaded fighter jets to 'escort' the president's plane either out of their air space or to a safe landing zone where he could then explain himself to the proper authorities.