My guess is that despite the strong long term overall link, it's too difficult to draw a meaingful link between any particular executive decision on this and an

My guess is that despite the strong long term overall link, it's too difficult to draw a meaingful link between any particular executive decision on this and any particular outcome, causing a tragedy of the commons. I think it's a good guess because it's a powerful explanation for many other such questions about "Why don't they just ____?"