[popopje]

one of the major points made in the documentary is that the guy making bombs in the afternoon is one of the bad guys, but calling him out one way or the other is a terrible idea for your average village. the reason they aren't pointing out the bad guy is because as you say, that robot truck is going to leave that evening. you don't want the bad guy's friends to find out, and you don't want the robot truck to start firing.

[bane]

Furthermore, "find the bombmakers" is useless when the population of an entire village has been pressed into service in making bomb components like wooden pressure triggers. Thus the entire village are bombmakers.

[lostlogin]

That makes it sound like the villagers are unwilling. If they are willingly making bombs it is considerably harder to stop them.