I quit watching football a while ago. So far, nothing has made me question that decision. Now, though, with the news that San Francisco plate Chris Borland is retiring after one year due to fears of brain injury, that decision is pretty strongly reaffirmed.
This Sports on Earth article on the possible ramifications of Borland's decision spells out the issue quite clearly. One of the most telling quotes:
" This is the problem for the NFL. The response is not to change the game itself; the response is to find people who do not understand that the game needs to be changed. It sees players -- humans -- as churn … as short-term investments, solely. It is pretending that everything is fine because the money is flowing so freely."