How is it constructive to say that there's nothing we can do about people's appetites for rhino horns when there's 70 years of evidence of that not being the ca

How is it constructive to say that there's nothing we can do about people's appetites for rhino horns when there's 70 years of evidence of that not being the case? It's not positive, it's an overall defeatist attitude thinly veiled in sci-fi speculation.