Usefulness to whom, and in what context? In the case of the climate change "debate", which has significant parallels to this one, denial is useful to entrenched

Usefulness to whom, and in what context? In the case of the climate change "debate", which has significant parallels to this one, denial is useful to entrenched interests at the expense of everyone else — including, ultimately, those same interests. How "useful" is that, exactly?