The terrorist attacks at the Brussels airport and on an inner city subway line demonstrate yet again how difficult it is to defend against them. The bombs may have been relatively crude and the attacks conducted prematurely as a result of recent police raids on suspected terrorist hideouts, but the symbolic impact of wanton death and destruction in the heart of the European Community was designed to polarise the relations between Muslims and non-Muslims within it as well as undermine public confidence in the ability of security services to thwart even relatively low-level atrocities such as these.
All too often public attention focuses on how to prevent this type of attack rather than on its underlying causes. In turn, it is easier to blame "extremists" and the ideologies that motivate them rather than consider the background conditions that led to their radicalisation.
In Belgium as well as France, there are a large number of second-generation males of North African descent who are profoundly alienated and disenchanted with their place in society. Devoid of education and economic opportunity, they constitute a seething mass of resentment that finds its expression in anti-establishment behaviour, be it petty criminality, counter-cultural music or irregular armed warfare. These are what Marx called "lumpenproletarians", people who see themselves as having no standing or status in society, and who have provided fertile recruiting grounds for revolutionaries and militants of many persuasions for centuries.
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Outside of Brussels is a suburb - some would call it a ghetto - called Molenbeek that is overwhelmingly Moroccan and Turkish in demographic heritage, to which have been added more recent migrants from North Africa and the Levant. It is a disadvantaged place, devoid of opportunity and hope. Authorities estimate that there are 100 jihadists, including returned Daesh fighters, living in Molenbeek, and that these do not include the 500 Belgian citizens who have gone to fight for Daesh in the battlefields of Syria, Iraq and Libya.