"If you want and the NFL want to follow junk science so be it."
a) I'm a scientist. I retired from a career in the computer chip industry; manufacturing at the start, and development at the end.
b) I'm not an expert on the human brain *.
But to my knowledge it is a consensus, "junk science" or not, that head trauma can cause symptoms.
c) In the NHL, players used to not wear helmets. I think the NFL can update, if they're serious about the welfare of the players.
" It is hard to avoid helmet to helmet. " #111
d) They're big boys.
I think they can do what they make an effort to do; EVEN at the risk of benefiting themselves and their teammates.
e) The penalty for helmet to helmet / head-ramming can be increased; and players that do so could be further penalized; even ejected from the game, or suspended for multiple games.
Why should the players take it seriously, if the league doesn't?
BUT !!
If you really don't think head trauma is a health risk, why don't you put an ad in Craigslist for a teenager to spend a few weeks whacking your skull with a stout wooden paddle? 8 hours a day should be enough.
If you're right, there shouldn't be any permanent medical consequence; and you'll have the rewarding experience of providing one anecdote to support your position.
* But I can recommend either
Brocca's Brain, or my personal favorite,
The Dragons of Eden which won a Pulitzer; a marvelous book on the evolution of the brain.