This raises some interesting questions.
Should a medical association observe primum non nocere by completely refusing to take part, as the American Psychiatric Association has advised when it comes to interrogation and torture?
Or should the medical professionals take a harm reduction approach, like as has been done for serious drug use, and call for improved safety standards in equipment (e.g., helmets, gloves) and scoring (e.g., reduce importance of KO/TKO)?
Certainly, consenting adults can and should do what consenting adults want to do.
For me, boxing (and MMA) as a profession seems an awful lot like rich people exploiting the youth, recklessness, and desperation of those with limited options. In that sense, pro-fighting is as much of a public health issue as dog-fighting is a PETA/Humane Society issue.
To be clear, I don’t want boxing to be banned any more than I want a vegan to take away my bacon.