Duh!

Was just watching a cable TV discussion of football concussion injuries.  Two things I found striking.  One was a comment by a sportscaster who stated that playing pro football is entirely volitional.  Not quite right!
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Many who play pro football come from socioeconomic backgrounds which markedly constrain their opportunities to improve the quality of their lives.  This is the very same circumstance that provides human resources for undesirable, often high risk, jobs, for example the military.  Additionally, there was no mention of boxing,, a sport in which the objective is to injure your opponent's brain--to knock 'em out.  If you review the population of boxers, you will find that many come from poor families or disadvantaged childhoods.  Boxing is their way out of the "hood."  Why is boxing not a significant part of the discussion of sports-related brain injury?