Marianne, all three of those articles were very distressing...
As for the third article from Wikipedia, the exceptionally high rate of domestic abuse against women among athletes, I scanned it but did not see any mention of a correlation with the athletes' brain injuries from repeated concussions. The CBC (Canadian Broadcast Corporation) did a wonderful special on that sometime in the 2000's.
Canadian ice hockey players, certainly boxers, football players...average life span in one such group was something like 53 years, attributable to the brain injuries, predisposing to instability and domestic violence. I had never heard of the boxer Floyd Mayweather, highest paid athlete in the world, and beating up the women in his life, however very little attention given to that...