15. Mike Perry
Former UFC fighter Perry went through a lot of issues in 2020. Disgusting footage emerged of the Floridian knocking out an older man in a Texas restaurant after the pair had a verbal dispute. Finally, an emotional Perry ended the dispute with his fists (via Daily Mail).

It was disgraceful because he was a trained fighter against another vulnerable person. This wasn’t a fair fight because of his youth and training. In the end, the UFC suspended him because they wanted him to seek treatment. In 2022, he became a bare-knuckle boxer, which will not help his brain health.