Here's a great point

Michael Barone warns us to beware of geeks carrying climate and healthcare formulas. Let me add some other ones; the actuarial formulas that told us that Social Security and Medicare couldn't help but be solvent--ignoring the fact that paying for someone's retirement will induce them to stop taking other measures for one's retirement. Little things like "having the babies that will grow up to pay FICA tax," for example.

God warns us about presuming on the future. Maybe we should listen to Him sometime.