An impromptu memorial on Las Ramblas, the site of the August 17 attack in Barcelona, August 2017.
Albert Gea / Reuters

The frequency of Islamic State (ISIS) attacks in Europe remains exceptionally steady, with authorities struggling to respond to the scale of the threat. The incidents in Spain and Finland last week epitomized the trend. In Spain, a group of primarily Moroccan terrorists drove a van into a crowd on La Rambla in Barcelona, replicating recent attacks in France, Germany, Sweden, and the United Kingdom. Another van attack terrorized the Spanish town of Cambrils hours later. In total, 15 people were killed and over 120 injured. Meanwhile, in Finland, an 18-year-old asylum seeker named Abderrahman Mechkah, also from Morocco, killed two and injured eight in the city of Turku in a knife attack. Finnish authorities are treating the incident as an act of terrorism.

All of this is well in line with Islamist strategy in Europe in recent years. For one, the countries affected should not come as a major shock. Since the

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