Yes, there's been a history in wolf control programs of not doing the control programs properly—not continuing to control long enough over time or killing the wrong wolves and not controlling the wolves that control the behaviour of wolves. Those have failed to produce, in some cases, reasonable results.
There's just not a lot of stuff where people have said that we need to treat what we're doing as an experiment, monitor it carefully and compare it to the alternative, as scientists would do in a control-impact comparison experiment.