Design can never be an ultimate explanation for anything. It can only be a proximate explanation. A plane or a car is explained by a designer but that's because the designer himself the engineer is explained by natural selection.
I suppose if you look back to your early childhood you accept everything...
I wanted to end my life so bad and was in my car ready to go down that ramp...
A woman in love can't be reasonable - or she probably wouldn't be in love.
