It’s really pure physics.
The NFL players are by far the top level in speed and size, so they’re going to have the highest g-force collisions.
Unfortunately while their muscles are the biggest, their brain tissue is just as impact sensitive as anybody else.
You are correct. Your user name obviously indicates that you
are a follower of auto racing which is another high risk enter
prise. The thing we realize is the more and the longer people
engage in high risk activities the better the chance of harmful
incidents occurring. There is an element of our society that
seems to thrive on attempting to eliminate all posibility of
risk. To me that is absurd.