As much as I see where you are coming from, boxing and MMA don't really offer the same environment as being "a lad" at the footy.. In most cases there a lot of beer and drugs involved also there's the sense of security that being with your mates offers, at the end of the day young lads and even some grown men treat this behaviour as a hobby, blowing a little steam off, something they can do at weekend and return to the normal lives the minute it's over with...
whilst you might not agree with it that's the mentality of it.. Taking up boxing, MMA or even joining the army and fighting for the county requires a lot more commitment.