I have a feeling, that for some of us, equipped with the biological response mechanisms for living a difficult life at risk of starvation, animal mutilation, conflict born decapitation, the fear response just feels like it has to get use, and so creates ludicrous levels of terror about things that are in reality minor, or alternatively extrapolates dangerous things that are of small and insignificant probability to seeming likelihood; alternatively I am getting old and increasingly paranoid about my own mortality.