Mixed martial arts (MMA) fighters should be held even more responsible for their physical actions outside of the cage. Just look at what a loose cannon like Jonathan "War Machine" Koppenhaver can do when given the opportunity to impose his gift of being able to fight.
Like Koppenhaver, but to a lesser degree, former Ultimate Fighting Championship (UFC) Heavyweight Lavar Johnson has joined a pitiful group of cage fighters gone wrong. Remember, it was revealed a few months back that Johnson had assaulted his girlfriend, slamming her head against the wall before ending with knees and punches.