Why? This was always the case in world's history, and we survived. If it was possible to address it with policy at a relatively low cost, then I'd be up for it

Why? This was always the case in world's history, and we survived. If it was possible to address it with policy at a relatively low cost, then I'd be up for it, but something tells me that there is no policy that can make 100% (or even 90%) of people make rational life choices. Which means that the only option left is cleaning the messes caused by irrationality, and that's very expensive.