I think the point is that the traps are not intended to catch gorillas. Young gorillas sometimes get caught in them and die. It's not the fault of these people hunting bush-meat that gorillas are endangered. If it hadn't been for westerners coming over for generations and hunting gorillas to near the point of extinction, the few gorillas that accidentally get caught in these traps and die wouldn't be threatening the survival of the species. Unfortunately, that is the case, and in our efforts to undo the damage that was caused to the gorillas, we end up hurting people who are just trying to catch something to eat.