I wrote a short opinion piece in the Herald outlining some of my thoughts about the Brussels terrorist attacks. Unless the root causes of the problem are addressed, there will be no end to them. Even if they overlap in the form of foreign fighters, those root causes primarily reside in the disaffection and alienation produced by socio-economic and cultural grievances at home rather than in the conflicts of the Middle East. The solution is to be proactive as well as reactive to the threat posed by domestic radicalisation, and that involves social reform as well as better human intelligence collection in the communities from which home-grown jihadists emerge.