AKA "The Peltzman Effect" - https://en.wikipedia.org/wiki/Risk_compensation#Peltzman_eff...
Was too busy to cite sources at the time, but for posterity:
https://www.nytimes.com/2017/01/06/opinion/the-dangers-of-sa... https://www.usatoday.com/story/sports/ncaaf/2013/07/30/concu... https://sports.cbslocal.com/2015/07/03/lemco-why-football-ne...