You assume we are still so-called stewards of wildlife. This might have been the case in the past, but things have changed drastically in the past two decades. It's not a matter of doing something anymore but learning to let go before we lead to another cataclysm. We continue to function on the basis of outdated facts and information which no longer reflect reality. See the independent report by the WWF here (link) for evidence.
I only brought up children because you did. However, I do believe our recent fascination - although obsession seems more appropriate - and the recent fertility crisis are intimately related.