Admiral Ackbar knew the battlefield, always wise to look out for his opponents tactics. The arsenal at the Empire’s disposal was wide, and sometimes includes indirect thrusts in the form of a trap—things he knew well. Not a lot of thought has to go into setting up a booby trap since the tactic is fairly static. You set it up, you leave it there, and you let the rebel scum do all the work. The same thing applies in argumentation (in the classical sense).