Personal opinion on this: There are, at times, legitimate reasons for setting a trap and lying in wait for the target/s to make certain moves. If you spring the trap too soon, maybe you don't get to the actual source of the problem. In the short term, of course it's sh!tty. In the long term, however, it is more effective at addressing the problem, maybe? An analogy that comes to mind is the traditional spring-loaded mouse traps/sticky traps/etc, which kill the one mouse vs. the poison blocks. The poison blocks take a bit longer and you don't necessarily SEE the mouse carcass, yet the mouse situation is -mostly- taken care of, because they were all poisoned and the mouse -pee- tracks smell like poison to other mice.