When I was little, I believed (sort of) that Santa Claus existed. It was a working hypothesis that worked, and I didn't look behind it until it became untenable. Now I effectively assume my continuing identity as a person - because that works, sort of, too. In me, and most people I know, the baton of consciousness, of awareness of one's I-ness, is repeatedly exchanged at unimaginable speeds between the two hemispheres. That baton seems to get dropped by people suffering certain forms of dementia - with increasing frequency as their condition worsens, being eventually only picked up and handed to and fro for brief, sometimes apparently fortuitous periods, if at all. How cruel (alongside other pains and indignities) to lose the working hypothesis that everyone else lives by. But perhaps, isolated in the permanently unfamiliar and frightening. Now they may be closer to the reality of the human condition than the rest of us. As with Santa, the mere fact that a working hypothesis produces a desirable and convenient result does not make it correct.
Take famine. We are told that "famine is rare". But across what data-set is that claim true? Across the data-set of what we actually know, about what is actually happening, at the present time? But that is a profoundly-inadequate data-set. We ought to consider also what we don't know about what is happening right now (Do we know whether or not, even right now, a serious famine is underway in under-reported/remote in parts of Africa?). More important, we ought to consider what might have happened, in recent history (has humanity quite possibly been merely lucky not to have experienced a mega-famine, in recent times (we may have come close, for instance, in 2007-9, during which period most of the world's countries resorted to banning food exports)?
If you're into science, read on.