A few years ago in Amsterdam I was shown the most popular manual published in the Netherlands, in Dutch, on how to raise one's children as proper Muslims. The book included virulently anti-Semitic passages, based on Muslim holy texts. After the Jewish community objected, the authorities forced the publisher to put white tape over the offending passages. The tape could easily be peeled off by purchases so that these words could be read.
Or consider what has just happened. A Turkish-Dutch researcher publicized systematic anti-Semitism among other Muslims in the Netherlands, including a dramatic video that showed teenage boys calling for genocide and praising Hitler.
What happened? The researcher, Mehmet Sahin, had to go into hiding after being accused by others of being a Jew and a Zionist.