Efforts to hold the European Union (EU) together take one step forward, and two steps back. Explosions reported to have killed at least 28 people in Brussels on March 22 undermine recent signs that the union is better together. Violent attacks are rare, especially in western Europe, but high in impact. The risk is that questions of prosperity and fairness that ought to decide the bloc's future get pushed aside.
The attacks targeted the administrative and infrastructural heart of the EU - Brussels airport and the Maelbeek metro station near the European Commission buildings. They come at a time when officials had struck a blow for European unity.
A recent pact to return migrants to Turkey, in return for accepting others in a more systematic way, offered a pragmatic solution to an apparently unsolvable problem. True, the deal was strong-armed through by German Chancellor Angela Merkel, and Turkey's human rights record complicates efforts to bring it into the EU. But it showed that Europe's leaders can act collectively.
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The causality of free movement is even less easy to pinpoint. The recently detained militant suspected of engaging in November's Paris shootings was born in Belgium. But suggestions of major security lapses by Brussels - Salah Abdeslam was found close to his family house - could cause barriers to spring up. The eroding of visa-free travel could wipe 0.2 per cent from Europe's gross domestic product, Morgan Stanley has estimated. But the psychic income from being fenced off will make that seem worthwhile to many voters.
Europe's future should hinge on prosperity and fairness, as well as security. On the first two, there is a strong case that a British exit after June 23's referendum would be bad for jobs and growth. But the argument is not a knock-out on either side. If the desire to focus on facts is overwhelmed by the tragedy in Brussels, no one will be better off.
