That?s because he was shot in the brain.
The non-severe woundings bit refers to bullets maintaining structural integrity through other parts of the body, usually the torso, which end of leaving focal, less serious and more easily treatable wounds than the explosive, diffuse and sometimes inoperable destruction left by hollow points.
The best you can hope for after being shot in the brain is not having too drastic behavioural or personality changes.
You're FOS....Many soldiers were shot through the head with military FMJ bullets and survived...some with no ill effects from the wound.
I have a friend who was shot through the head in Vietnam and he is perfectly normal...
As the article YOU posted says....FMJ bullets can pass right through a persons body and cause little damage.....JFK was not hit in the head by a FMJ bullet.....