Depending on statistics (medical findings), between 10 to 30 thousand different deseases can befall a human body. It's a miracle that we have survived as a species. Wear and tear is a factor, but mostly Bacteria and Viruses prefer to "attack" us.
So, every day we wake up healthy, we should be thankful that none of those thousands of "attackers" have selected you/me as a target.
It must give food for thaught, that the "crown of evolution" is still mainly threathened by microscopip "villans", that have staunchly refused to turn into something "higher", not parttaking on evolution, perfectly satisfied with attacking "the crown of the evolution" relentlessly and successfully, by refusing to turn into a worm or a mouse eventually.
Never mind the pistol toting humans, we are likely to be killed by microscopic little villans.