Even as the families of those killed at the Heaton Park synagogue were preparing their funeral services, Palestinian activists were gearing up for yet another march on London. Officially, it is a protest against the proscription of Palestine Action as a terrorist group. But we know from experience that it will be used as a front for rank anti-Semitism and the glorification of Hamas. Marchers on these demonstrations routinely call for the death of Jews, the destruction of Israel and 'globalisation of the intifada', a direct incitement to export to the wider world the sort of random terrorism committed by...