Apparently, a daily recurrence of racial abuse is prompting more players to permanently drop the ball. Jonathan Martin played three NFL seasons before retiring at the age of 25. While playing for the Miami Dolphins in 2013, Martin alleged that he was subjected to constant harassment and racist insults from fellow teammates. He also charged that this abuse was tolerated and encouraged by the coaching staff. A lengthy investigation found that Richie Incognito , one of Martin’s white teammates, called him the n-word, mulatto, and “darkness.” Incognito’s brand of humor also included threatening to kill Martin and swapping text messages with teammates about shooting Black people.
The (SIRC) notes two important points, that racism: "...an important factor in the problem of football hooliganism itself (SIRC, (2007). The actual extent of racism is virtually impossible to measure as detailed statistics in this context are almost non-existent." The issue of football hooliganism was better known, at least until recently in the UK. Of course it is a less contentious issue, as the vast majority of people can easily condemn it. When it comes to racist hooligan behaviour then the issue become that divisive. Since, it appears many in the UK still harbour racist attitudes in various ways.