I've never understood why theres so much violence attached to soccer. Brawls, flares and more. I have seen the theories that its related to the low scores - and the tension built up. Like its common and possible to have a 0-0 game or a draw 1-1, or win 1-0.
In contrast to the Australian Rules Football (AFL) where a score can be 80 - 100 points per game. A goal = 6 points and a point = 1 point. So a match - for one team might be 12 goals = 72 points and 12 points = 12 points for at total team score of 84. - the losing opposition score might be - in good close match = 80 points. So thee could be 24 scoring kicks for winning teams and as many or more for losing team. The tension theory suggest that this high scoring releases tension regularly..
Another difference is that AFL to a large extent - is a game where families, women and children, go along, in addition supporters from opposing sides mix with each other and many times sit next to each other. As well as travel together on trains etc. Pretty much always without fear of violence.
I know that in UK many venues sperate fans with mesh fences and have much lower crowd numbers - and families would not consider attending many matches.
At a grand final the crowd of 98,000 at the AFL grand final at the MCG - Police arrested one man, evicted 14 people from the MCG and issued nine penalty notices for a range of offences on Saturday. None of the offences were violence related.