Attacks such as those in Brussels are not intelligence “lapses,” but rather the inevitable product of the deep integration and institutional connections between terrorist networks and the intelligence agencies of Europe and the United States.
To stop their movements across borders, to subject them to standard security protocols, would have negative consequences for the wars these forces are waging across the Middle East. This would greatly endanger the entire strategy pursued by the Obama administration and its European allies—the use of Islamist proxy forces, often linked to Al Qaeda or its offshoot ISIS, in place of “boots on the ground.”
The attacks such as those in Brussels take place either as “blowback” operations by Al Qaeda or Islamic State forces, embittered by the failure of the US and European governments to carry out their promised overthrow of the Assad regime, or they are facilitated by sections of the state for whom terrorist acts in Western countries serve the purpose of shifting foreign and domestic policy—or some combination of the two.
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In other words, most of these "attacks" are to some extent "inside jobs".
If you disagree with this claim, please show me your proof. And "secret evidence" (anything not presented in open court) doesn't count. It never should have counted in the first place.