If we were considerably below this level of technology and knowledge, I would be dead.
"so what?" you say. "Human minds are all the same."
But they're not. My frailness leads to thoughts and emotions and philosophies which the healthy do not have directly. They know it only through the voices of the weak. The weak are vampires on the strong. Perhaps it is reciprocal. To use vampiric imagery is to emphasize the helplessness and the marginality of our existence.