It was a typical "fighter/hero against mafia" movie.
IMO, there's difference between professional fighting and violence.
there was no good justification why he was fighting the mafia and where did he get the skills to do dangerous actions, even if he is the best fighter in the world!
and when it comes to felony, violence always beats martial arts unless you're the guy from Taken movie.
Total waste of Jake Gyllenhaal's talents, but I was excited to see Connor McGregor acting.