Sure, a lot of problems could be solved with a cultural shift, but most people are in a rat race to survive

And those in politics are not interested in change since because (the cynical part starts here) they are selected / sponsored by billionaires who own the media, or go to politics as a job and not to help anyone but themselves

On a side note storing fat to feed the brain in case of bad times makes sense. In the past there were no convinience stores, nor refridgerators