There is no flaw in the design of the human body.
The flaw is with the pollution of air, water, food and environment. This catalyses entropy. The optimal functionings of the human body are being subverted. The whole fiasco is a cycle of imminent destruction from habitat to anatomy.
If almost everything is being weaponised against us, how can this be an act of chance? This is the controlled demolition of the human race happening on a subtle level.