Indeed it does not usually happen. Those sports usually attract smaller crowds. The thugs tend to go for the biggest crowds which are available. In most of Europe, those are football crowds. In my liberal, understanding way, my gut feeling is that these criminals should be chopped up into very small pieces. I make no defence of the indefensible. What I am tired of, is the use of the term "English football fans" as a perjorative. English football fans despise this rabble as much as you or I.