HERE ARE TWO books on the subject of anti-Semitism and the Holocaust in two small European countries: Holland and Denmark. The stories are distinctly different. Sirnon Kuper, who is also a leading sports writer, shocks us fkm the start. Even today, the Feyenoord (Rotterdam) football fans shout anti-Semitic abuse at the Ajax (Amsterdam) supporters. There is an element of class warfare in this: the Rotterdamers consider themselves tough workers and look on their rivals as rich burghers.