Another reason for under-reporting is that victims will not report incidents, especially antisemitic slurs. The general idea being: what's the point?
The Jerusalem Post reports:
In a report issued last year, the EU’s Agency for Fundamental Rights said that European countries lack systematic methods of collecting data on anti-Semitism, contributing to “gross underreporting of the nature and characteristics of anti-Semitic incidents that occur.”Read more.
In its report, the agency said “few EU member states operate official data collection mechanisms that record anti-Semitic incidents in any great detail,” which “limits the ability of policy makers” to deal effectively with growing hate crimes.
According to a 2014 study by the Kantor Center for the Study of Contemporary European Jewry, anti-Semitic violence rose by nearly 40 percent over the previous year. While steps have been taken to combat this rise in 2015 – including the European Commission’s appointment of the continent’s first coordinator on combating anti-Semitism – the violence is expected to continue to rise in the coming years.