Millwall fans are known for being the toughest, nastiest bunch of fans in all of English soccer. There used to be all kinds of trouble with hoolinganism over there and Millwall was notorious for it. Their big chant is "No one likes us, we don't care!" So if one guy stepped forward in that restaurant, go figure, Millwall fan. (And I ain't criticizing; I love it. Not the violence but the rest of it.)
You're right, how come nobody helped him out. Not one person?